18938812 has 6 divisors (see below), whose sum is σ = 33142928. Its totient is φ = 9469404.

The previous prime is 18938809. The next prime is 18938831. The reversal of 18938812 is 21883981.

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, 2367348 + ... + 2367355.

Almost surely, 2^18938812 is an apocalyptic number.

It is an amenable number.

18938812 is a deficient number, since it is larger than the sum of its proper divisors (14204116).

18938812 is a wasteful number, since it uses less digits than its factorization.

18938812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734707 (or 4734705 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 18938812 is about 4351.8745386327. The cubic root of 18938812 is about 266.5534109339.

The spelling of 18938812 in words is "eighteen million, nine hundred thirty-eight thousand, eight hundred twelve".