18538664 has 16 divisors (see below), whose sum is σ = 34845120. Its totient is φ = 9246640.

The previous prime is 18538643. The next prime is 18538679. The reversal of 18538664 is 46683581.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (2177820).

Almost surely, 2^18538664 is an apocalyptic number.

It is an amenable number.

18538664 is a deficient number, since it is larger than the sum of its proper divisors (16306456).

18538664 is a wasteful number, since it uses less digits than its factorization.

18538664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680 (or 5676 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 18538664 is about 4305.6548863094. The cubic root of 18538664 is about 264.6627441027.

The spelling of 18538664 in words is "eighteen million, five hundred thirty-eight thousand, six hundred sixty-four".