18318816 has 36 divisors (see below), whose sum is σ = 52094952. Its totient is φ = 6106176.

The previous prime is 18318791. The next prime is 18318821. The reversal of 18318816 is 61881381.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

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 5 ways as a sum of consecutive naturals, for example, 31516 + ... + 32091.

It is an arithmetic number, because the mean of its divisors is an integer number (1447082).

Almost surely, 2^18318816 is an apocalyptic number.

18318816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18318816 is an abundant number, since it is smaller than the sum of its proper divisors (33776136).

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

18318816 is a wasteful number, since it uses less digits than its factorization.

18318816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63623 (or 63612 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 18318816 is about 4280.0485978549. The cubic root of 18318816 is about 263.6123788074.

The spelling of 18318816 in words is "eighteen million, three hundred eighteen thousand, eight hundred sixteen".