18934564 has 72 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 7761600.

The previous prime is 18934547. The next prime is 18934607. The reversal of 18934564 is 46543981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266649 + ... + 266719.

It is an arithmetic number, because the mean of its divisors is an integer number (558600).

Almost surely, 2^18934564 is an apocalyptic number.

It is an amenable number.

18934564 is an abundant number, since it is smaller than the sum of its proper divisors (21284636).

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

18934564 is a wasteful number, since it uses less digits than its factorization.

18934564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 132 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 18934564 is about 4351.3864457205. The cubic root of 18934564 is about 266.5334800188.

The spelling of 18934564 in words is "eighteen million, nine hundred thirty-four thousand, five hundred sixty-four".