18366864 has 20 divisors (see below), whose sum is σ = 47447856. Its totient is φ = 6122272.

The previous prime is 18366847. The next prime is 18366869. The reversal of 18366864 is 46866381.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18366869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191274 + ... + 191369.

Almost surely, 2^18366864 is an apocalyptic number.

It is an amenable number.

18366864 is an abundant number, since it is smaller than the sum of its proper divisors (29080992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18366864 is a wasteful number, since it uses less digits than its factorization.

18366864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382654 (or 382648 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 18366864 is about 4285.6579424868. The cubic root of 18366864 is about 263.8426518749.

The spelling of 18366864 in words is "eighteen million, three hundred sixty-six thousand, eight hundred sixty-four".