18864856 has 16 divisors (see below), whose sum is σ = 35418600. Its totient is φ = 9419904.

The previous prime is 18864847. The next prime is 18864871. The reversal of 18864856 is 65846881.

It is a congruent number.

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, 9136 + ... + 11008.

Almost surely, 2^18864856 is an apocalyptic number.

It is an amenable number.

18864856 is a deficient number, since it is larger than the sum of its proper divisors (16553744).

18864856 is a wasteful number, since it uses less digits than its factorization.

18864856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138 (or 3134 counting only the distinct ones).

The product of its digits is 368640, while the sum is 46.

The square root of 18864856 is about 4343.3691991356. The cubic root of 18864856 is about 266.2059949168.

The spelling of 18864856 in words is "eighteen million, eight hundred sixty-four thousand, eight hundred fifty-six".