18956172 has 24 divisors (see below), whose sum is σ = 44303616. Its totient is φ = 6308368.

The previous prime is 18956153. The next prime is 18956183. The reversal of 18956172 is 27165981.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18956172.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10993 + ... + 12599.

It is an arithmetic number, because the mean of its divisors is an integer number (1845984).

Almost surely, 2^18956172 is an apocalyptic number.

18956172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18956172 is an abundant number, since it is smaller than the sum of its proper divisors (25347444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18956172 is a wasteful number, since it uses less digits than its factorization.

18956172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597 (or 2595 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 18956172 is about 4353.8686245683. The cubic root of 18956172 is about 266.6348302271.

The spelling of 18956172 in words is "eighteen million, nine hundred fifty-six thousand, one hundred seventy-two".