18858172 has 12 divisors (see below), whose sum is σ = 33085360. Its totient is φ = 9405216.

The previous prime is 18858157. The next prime is 18858173. The reversal of 18858172 is 27185881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18858173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4128 + ... + 7399.

Almost surely, 2^18858172 is an apocalyptic number.

It is an amenable number.

18858172 is a deficient number, since it is larger than the sum of its proper divisors (14227188).

18858172 is a wasteful number, since it uses less digits than its factorization.

18858172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11940 (or 11938 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The square root of 18858172 is about 4342.5996822180. The cubic root of 18858172 is about 266.1745514211.

The spelling of 18858172 in words is "eighteen million, eight hundred fifty-eight thousand, one hundred seventy-two".