18857172 has 24 divisors (see below), whose sum is σ = 44140096. Its totient is φ = 6265728.

The previous prime is 18857159. The next prime is 18857183. The reversal of 18857172 is 27175881.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18857172.

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, 1713 + ... + 6375.

Almost surely, 2^18857172 is an apocalyptic number.

18857172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18857172 is an abundant number, since it is smaller than the sum of its proper divisors (25282924).

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

18857172 is a wasteful number, since it uses less digits than its factorization.

18857172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007 (or 5005 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 18857172 is about 4342.4845422868. The cubic root of 18857172 is about 266.1698464890.

The spelling of 18857172 in words is "eighteen million, eight hundred fifty-seven thousand, one hundred seventy-two".