18039308 has 12 divisors (see below), whose sum is σ = 36078672. Its totient is φ = 7731120.

The previous prime is 18039299. The next prime is 18039311. The reversal of 18039308 is 80393081.

18039308 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322103 + ... + 322158.

It is an arithmetic number, because the mean of its divisors is an integer number (3006556).

Almost surely, 2^18039308 is an apocalyptic number.

It is an amenable number.

18039308 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18039308 is a wasteful number, since it uses less digits than its factorization.

18039308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644272 (or 644270 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18039308 is about 4247.2706530194. The cubic root of 18039308 is about 262.2647712829.

It can be divided in two parts, 1803 and 9308, that added together give a palindrome (11111).

The spelling of 18039308 in words is "eighteen million, thirty-nine thousand, three hundred eight".