18972188 has 12 divisors (see below), whose sum is σ = 33524400. Its totient is φ = 9393792.

The previous prime is 18972181. The next prime is 18972193. The reversal of 18972188 is 88127981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18972181) 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, 22613 + ... + 23436.

It is an arithmetic number, because the mean of its divisors is an integer number (2793700).

Almost surely, 2^18972188 is an apocalyptic number.

It is an amenable number.

18972188 is a deficient number, since it is larger than the sum of its proper divisors (14552212).

18972188 is a wasteful number, since it uses less digits than its factorization.

18972188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46156 (or 46154 counting only the distinct ones).

The product of its digits is 64512, while the sum is 44.

The square root of 18972188 is about 4355.7075200247. The cubic root of 18972188 is about 266.7099020175.

The spelling of 18972188 in words is "eighteen million, nine hundred seventy-two thousand, one hundred eighty-eight".