18508272 has 20 divisors (see below), whose sum is σ = 47813160. Its totient is φ = 6169408.

The previous prime is 18508249. The next prime is 18508277. The reversal of 18508272 is 27280581.

It is a super-2 number, since 2×18508272² = 685112264851968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18508277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192747 + ... + 192842.

It is an arithmetic number, because the mean of its divisors is an integer number (2390658).

Almost surely, 2^18508272 is an apocalyptic number.

18508272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18508272 is an abundant number, since it is smaller than the sum of its proper divisors (29304888).

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

18508272 is a wasteful number, since it uses less digits than its factorization.

18508272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385600 (or 385594 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18508272 is about 4302.1241265217. The cubic root of 18508272 is about 264.5180369893.

The spelling of 18508272 in words is "eighteen million, five hundred eight thousand, two hundred seventy-two".