18239864 has 16 divisors (see below), whose sum is σ = 34268400. Its totient is φ = 9101632.

The previous prime is 18239857. The next prime is 18239891. The reversal of 18239864 is 46893281.

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 3 ways as a sum of consecutive naturals, for example, 2549 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (2141775).

Almost surely, 2^18239864 is an apocalyptic number.

It is an amenable number.

18239864 is a deficient number, since it is larger than the sum of its proper divisors (16028536).

18239864 is a wasteful number, since it uses less digits than its factorization.

18239864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582 (or 4578 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 18239864 is about 4270.8153788240. The cubic root of 18239864 is about 263.2331203720.

The spelling of 18239864 in words is "eighteen million, two hundred thirty-nine thousand, eight hundred sixty-four".