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Fifteen (15, XV) is the natural number following fourteen and preceding sixteen. Fifteen is a triangular number. It is a composite number; its proper divisors being 1, 3 and 5. Its factorization is

In hexadecimal, as well as all higher bases, fifteen is represented as F. Fifteen is the magic result of a 3 by 3 magic square:

Fifteen is also:

See also: thirteen, fourteen, fifteen, sixteen, seventeen, integer, list of numbers.

This article is about the number. For the year AD 15, see 15. For information on the television program, see Fifteen (TV show)