18431

18431 is a natural number that follows 18430 and precedes 18432. In mathematics, it is notable as a semiprime, since it factorizes as 7 × 2633, with 2633 being prime. Its positive divisors are 1, 7, 2633, and 18431, giving a total of four divisors. The sum of its proper divisors is 2641, which is less than 18431, so 18431 is classified as a deficient number.

In decimal representation, 18431 consists of the digits 1, 8, 4, 3, and 1, with a digit sum of 17. It is an odd number.

As a semiprime, 18431 belongs to a class of numbers formed by the product of two primes, a topic of interest in elementary and computational number theory. While it participates in various numerical examples and studies, there is no particular widely recognized historical or scientific significance attached to 18431 by itself.

Beyond pure mathematics, 18431 can appear as an arbitrary identifier in catalogs, sequences, or data sets. However, it does not correspond to a widely cited constant, event, or object in popular reference sources.

See also: Semiprime, Deficient number, Natural numbers.