18136864 has 24 divisors (see below), whose sum is σ = 35851788. Its totient is φ = 9031680.

The previous prime is 18136843. The next prime is 18136871. The reversal of 18136864 is 46863181.

It can be written as a sum of positive squares in 2 ways, for example, as 16744464 + 1392400 = 4092^2 + 1180^2 .

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, 7984 + ... + 10000.

Almost surely, 2^18136864 is an apocalyptic number.

It is an amenable number.

18136864 is a deficient number, since it is larger than the sum of its proper divisors (17714924).

18136864 is a wasteful number, since it uses less digits than its factorization.

18136864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308 (or 2300 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 18136864 is about 4258.7397196823. The cubic root of 18136864 is about 262.7366947484.

The spelling of 18136864 in words is "eighteen million, one hundred thirty-six thousand, eight hundred sixty-four".