18938464 has 12 divisors (see below), whose sum is σ = 37285164. Its totient is φ = 9469216.

The previous prime is 18938443. The next prime is 18938471. The reversal of 18938464 is 46483981.

It is a self number, because there is not a number n which added to its sum of digits gives 18938464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295882 + ... + 295945.

It is an arithmetic number, because the mean of its divisors is an integer number (3107097).

Almost surely, 2^18938464 is an apocalyptic number.

It is an amenable number.

18938464 is a deficient number, since it is larger than the sum of its proper divisors (18346700).

18938464 is an equidigital number, since it uses as much as digits as its factorization.

18938464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591837 (or 591829 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 18938464 is about 4351.8345556788. The cubic root of 18938464 is about 266.5517782874.

The spelling of 18938464 in words is "eighteen million, nine hundred thirty-eight thousand, four hundred sixty-four".