18047864 has 16 divisors (see below), whose sum is σ = 34414200. Its totient is φ = 8870752.

The previous prime is 18047851. The next prime is 18047903. The reversal of 18047864 is 46874081.

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, 18647 + ... + 19590.

Almost surely, 2^18047864 is an apocalyptic number.

It is an amenable number.

18047864 is a deficient number, since it is larger than the sum of its proper divisors (16366336).

18047864 is a wasteful number, since it uses less digits than its factorization.

18047864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38302 (or 38298 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 18047864 is about 4248.2777686964. The cubic root of 18047864 is about 262.3062285774.

The spelling of 18047864 in words is "eighteen million, forty-seven thousand, eight hundred sixty-four".