18688864 has 12 divisors (see below), whose sum is σ = 36793764. Its totient is φ = 9344416.

The previous prime is 18688849. The next prime is 18688867. The reversal of 18688864 is 46888681.

It is a super-2 number, since 2×18688864² = 698547275220992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18688867) by changing a digit.

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 as a sum of consecutive naturals, namely, 291982 + ... + 292045.

It is an arithmetic number, because the mean of its divisors is an integer number (3066147).

Almost surely, 2^18688864 is an apocalyptic number.

It is an amenable number.

18688864 is a deficient number, since it is larger than the sum of its proper divisors (18104900).

18688864 is an equidigital number, since it uses as much as digits as its factorization.

18688864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584037 (or 584029 counting only the distinct ones).

The product of its digits is 589824, while the sum is 49.

The square root of 18688864 is about 4323.0618778824. The cubic root of 18688864 is about 265.3755870409.

The spelling of 18688864 in words is "eighteen million, six hundred eighty-eight thousand, eight hundred sixty-four".