18638964 has 24 divisors (see below), whose sum is σ = 48323520. Its totient is φ = 6212952.

The previous prime is 18638959. The next prime is 18638989. The reversal of 18638964 is 46983681.

18638964 is a `hidden beast` number, since 1 + 8 + 638 + 9 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86184 + ... + 86399.

It is an arithmetic number, because the mean of its divisors is an integer number (2013480).

Almost surely, 2^18638964 is an apocalyptic number.

It is an amenable number.

18638964 is an abundant number, since it is smaller than the sum of its proper divisors (29684556).

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

18638964 is a wasteful number, since it uses less digits than its factorization.

18638964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172596 (or 172588 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18638964 is about 4317.2866478843. The cubic root of 18638964 is about 265.1391887759.

The spelling of 18638964 in words is "eighteen million, six hundred thirty-eight thousand, nine hundred sixty-four".