18308668 has 12 divisors (see below), whose sum is σ = 36617392. Its totient is φ = 7846560.

The previous prime is 18308651. The next prime is 18308671. The reversal of 18308668 is 86680381.

18308668 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18308668.

It is a congruent number.

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, 326913 + ... + 326968.

Almost surely, 2^18308668 is an apocalyptic number.

It is an amenable number.

18308668 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.

18308668 is a wasteful number, since it uses less digits than its factorization.

18308668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653892 (or 653890 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18308668 is about 4278.8629330700. The cubic root of 18308668 is about 263.5636923903.

The spelling of 18308668 in words is "eighteen million, three hundred eight thousand, six hundred sixty-eight".