18158172 has 24 divisors (see below), whose sum is σ = 42696192. Its totient is φ = 6006000.

The previous prime is 18158137. The next prime is 18158191. The reversal of 18158172 is 27185181.

It is a congruent number.

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, 4204 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (1779008).

Almost surely, 2^18158172 is an apocalyptic number.

18158172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18158172 is an abundant number, since it is smaller than the sum of its proper divisors (24538020).

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

18158172 is a wasteful number, since it uses less digits than its factorization.

18158172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689 (or 11687 counting only the distinct ones).

The product of its digits is 4480, while the sum is 33.

The square root of 18158172 is about 4261.2406644075. The cubic root of 18158172 is about 262.8395460923.

The spelling of 18158172 in words is "eighteen million, one hundred fifty-eight thousand, one hundred seventy-two".