Nine hundred ninety-nine is the natural number following nine hundred ninety-eight and preceding one thousand. A natural number is either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). The former definition is generally used in number theory, while the latter is preferred in set theory and computer science. ... Cardinal 1000 one thousand Ordinal 1000th Numeral system Factorization Prime Divisor(s) Roman numeral Unicode symbol(s) , , Greek Prefix chilia Latin Prefix milli Binary 1111101000 Octal 1750 Duodecimal 6B4 Hexadecimal 3E8 1000 (one thousand) is the natural number following 999 and preceding 1001. ...

List of numbers — Integers << 0 100 200 300 400 500 600 700 800 900 >> This is a list of articles about numbers (not about numerals). ... The integers consist of the positive natural numbers (1, 2, 3, …), their negatives (−1, −2, −3, ...) and the number zero. ... In mathematics, −1 is the integer greater than negative two (−2) and less than 0. ... 0 (zero) is both a number and a numeral. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ... 200 is the natural number following 199 and preceding 201. ... Three hundred is the natural number following two hundred and ninety-nine and preceding three hundred one. ... Four hundred is the natural number following three hundred ninety-nine and preceding four hundred one. ... Five hundred is the natural number following four hundred ninety-nine and preceding five hundred one. ... Six hundred is the natural number following five and hundred ninety-nine and preceding six hundred and one. ... 700 (seven hundred) is the natural number following 699（six hundred ninety-nine） and preceding 701（seven hundred one）. Cardinal Seven hundred Ordinal 700th Factorization Roman numeral DCC Binary 1010111100 Duodecimal 4A4 Hexadecimal 2BC Vigesimal 1F0 It is the sum of four consecutive primes (167 + 173 + 179 + 181). ... 800 is the natural number following 799 and preceding 801. ... Nine hundred is the natural number following eight hundred ninety-nine and preceding nine hundred one. ... Cardinal 1000 one thousand Ordinal 1000th Numeral system Factorization Prime Divisor(s) Roman numeral Unicode symbol(s) , , Greek Prefix chilia Latin Prefix milli Binary 1111101000 Octal 1750 Duodecimal 6B4 Hexadecimal 3E8 1000 (one thousand) is the natural number following 999 and preceding 1001. ...
Ordinal	Nine hundred ninety-nine
Cardinal	999th
Factorization
Roman numeral	CMXCIX
Binary	1111100111
Hexadecimal	3E7
Octal	1747

999 is a Harshad number and a Kaprekar number. Written in base 10 and turned upside down it looks like 666. Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In linguistics, cardinal numbers is the name given to number words that are used for quantity (one, two, three), as opposed to ordinal numbers, words that are used for order (first, second, third). ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... In mathematics and computer science, base-16, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... The octal numeral system is the base-8 number system, and uses the digits 0 to 7. ... A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ... In mathematics, a Kaprekar number is a number that, in a given base, when squared, can be split into two numbers with the same number of digits as the original number which add up to the original number again. ... For other uses of 666 see 666 (disambiguation) 666 Cardinal Six hundred and sixty-six Ordinal 666th Factorization Roman numeral DCLXVI Binary 1010011010 Hexadecimal 29A Base32 KQ Base36 II In mathematics 666 is an abundant number. ...

Nine hundred ninety-nine is also:

• The largest 3 digit whole number in base 10.
• The telephone number for the emergency services in the United Kingdom and Hong Kong; see 9-9-9.
• The name of a significant London punk band active during the 1970s; see 999 (band).
• At Disney's The Haunted Mansion, the number of "happy haunts here, but there's room for a thousand. Any volunteers?"
• When a digital camera creates folder 999 in the DCIM folder, it announces a CF error and a new card must be loaded.
• Triple Nine is a television drama from Singapore.
• The Triple Nine Society is a high IQ society for the top tenth of one percent of the population.
• The number of J.R. "Bob" Dobbs. 333 is the number of ,,oBo,, the anti-"Bob".
• The nickname for the 999 Eyes of Endless Dream Carnival and Sideshow of the Damned
• No. 999, the first steam locomotive in the United States to operate at faster than 100 mph.
• Galaxy Express 999, a manga and anime created by Leiji Matsumoto.
• The secret number of The Death Dealers Clan from Auto Assault PC game.