18890864 has 20 divisors (see below), whose sum is σ = 38528040. Its totient is φ = 8948160.

The previous prime is 18890819. The next prime is 18890881. The reversal of 18890864 is 46809881.

It is a happy number.

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, 30767 + ... + 31374.

It is an arithmetic number, because the mean of its divisors is an integer number (1926402).

Almost surely, 2^18890864 is an apocalyptic number.

It is an amenable number.

18890864 is an abundant number, since it is smaller than the sum of its proper divisors (19637176).

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

18890864 is a wasteful number, since it uses less digits than its factorization.

18890864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62168 (or 62162 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18890864 is about 4346.3621570228. The cubic root of 18890864 is about 266.3282735473.

The spelling of 18890864 in words is "eighteen million, eight hundred ninety thousand, eight hundred sixty-four".