8000 (eight thousand) is the natural number following 7999 and preceding 8001. Natural number can mean either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). Natural numbers have two main purposes: they can be used for counting (there are 3 apples on the table), or they can be used for ordering (this is...

8000 is the cube of 20, as well as the sum of four consecutive integers cubed, 11³ + 12³ + 13³ + 14³. 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). ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... 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 binary numeral system represents numeric values using two symbols, typically 0 and 1. ... A duodecimal multiplication table The duodecimal (also known as base-twelve or dozenal) system is a numeral system using twelve as its base. ... In mathematics and computer science, 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 vigesimal (base-twenty) is a numeral system which is based on twenty. ... In arithmetic and algebra, the cube of a number n is its third power — the result of multiplying it by itself two times: n3 = n × n × n. ... 20 (twenty) is the natural number following 19 and preceding 21. ...

The fourteen tallest mountains on Earth, which exceed 8000 meters in height, are sometimes referred to as eight-thousanders. Cho Oyu, Lhotse, Makalu and Mount Everest as seen from the International Space Station. ...

Selected numbers in the range 8001 - 8999

• 8001 - triangular number
• 8002 - Mertens function zero
• 8011 - Mertens function zero
• 8012 - Mertens function zero
• 8017 - Mertens function zero
• 8021 - Mertens function zero
• 8039 - safe prime
• 8069 - Sophie Germain prime
• 8093 - Sophie Germain prime
• 8100 = 90^2
• 8111 - Sophie Germain prime
• 8119 - octahedral number
• 8125 - pentagonal pyramidal number
• 8128 - perfect number, harmonic divisor number, 127th triangular number, 64th hexagonal number, eighth 292-gonal number, fourth 1356-gonal number
• 8147 - safe prime
• 8189 - highly cototient number
• 8190 - harmonic divisor number
• 8191 - Mersenne prime
• 8192 - power of two
• 8233 - centered heptagonal number
• 8243 - Sophie Germain prime
• 8256 - triangular number
• 8257 - sum of the squares of the first fourteen primes
• 8269 - cuban prime of the form x = y + 1
• 8273 - Sophie Germain prime
• 8281 - sum of the cubes of the first thirteen integers, 91^2, nonagonal number, centered octagonal number
• 8321 - super-Poulet number
• 8326 - decagonal number
• 8385 - triangular number
• 8423 - safe prime
• 8436 - tetrahedral number
• 8464 = 92^2
• 8513 - Sophie Germain prime
• 8515 - triangular number
• 8543 - safe prime
• 8555 - square pyramidal number
• 8576 - centered heptagonal number
• 8625 - enneagonal number
• 8646 - triangular number
• 8649 = 93^2, centered octagonal number
• 8663 - Sophie Germain prime
• 8693 - Sophie Germain prime
• 8695 - decagonal number
• 8699 - safe prime
• 8712 - smallest number that is divisible by its reverse: 8712 = 4×2178 (excluding palindromes and numbers with trailing zeros)
• 8741 - Sophie Germain prime
• 8747 - safe prime
• 8778 - triangular number
• 8783 - safe prime
• 8801 - magic constant of n×n magic square and n-Queens Problem for n = 26.
• 8819 - safe prime
• 8833 - 88^2 + 33^2
• 8836 = 94^2
• 8911 - Carmichael number, triangular number
• 8926 - centered heptagonal number
• 8944 - sum of the cubes of the first seven primes
• 8951 - Sophie Germain prime
• 8963 - safe prime
• 8969 - Sophie Germain prime
• 8976 - enneagonal number