18665968 has 20 divisors (see below), whose sum is σ = 37332928. Its totient is φ = 9031680.

The previous prime is 18665951. The next prime is 18665981. The reversal of 18665968 is 86956681.

18665968 is an admirable number.

It is a super-2 number, since 2×18665968² = 696836722754048, which contains 22 as substring.

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, 18321 + ... + 19312.

Almost surely, 2^18665968 is an apocalyptic number.

It is an amenable number.

18665968 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.

18665968 is a wasteful number, since it uses less digits than its factorization.

18665968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37672 (or 37666 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 18665968 is about 4320.4129432266. The cubic root of 18665968 is about 265.2671709201.

The spelling of 18665968 in words is "eighteen million, six hundred sixty-five thousand, nine hundred sixty-eight".