18992868 has 24 divisors (see below), whose sum is σ = 45154368. Its totient is φ = 6211296.

The previous prime is 18992843. The next prime is 18992879. The reversal of 18992868 is 86829981.

It is a self number, because there is not a number n which added to its sum of digits gives 18992868.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14296 + ... + 15567.

It is an arithmetic number, because the mean of its divisors is an integer number (1881432).

Almost surely, 2^18992868 is an apocalyptic number.

It is an amenable number.

18992868 is an abundant number, since it is smaller than the sum of its proper divisors (26161500).

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

18992868 is a wasteful number, since it uses less digits than its factorization.

18992868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29923 (or 29921 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 18992868 is about 4358.0807702474. The cubic root of 18992868 is about 266.8067729033.

The spelling of 18992868 in words is "eighteen million, nine hundred ninety-two thousand, eight hundred sixty-eight".