18939884 has 24 divisors (see below), whose sum is σ = 36019200. Its totient is φ = 8681040.

The previous prime is 18939863. The next prime is 18939901. The reversal of 18939884 is 48893981.

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, 1664 + ... + 6375.

It is an arithmetic number, because the mean of its divisors is an integer number (1500800).

Almost surely, 2^18939884 is an apocalyptic number.

It is an amenable number.

18939884 is a deficient number, since it is larger than the sum of its proper divisors (17079316).

18939884 is a wasteful number, since it uses less digits than its factorization.

18939884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8093 (or 8091 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 18939884 is about 4351.9977022053. The cubic root of 18939884 is about 266.5584401100.

The spelling of 18939884 in words is "eighteen million, nine hundred thirty-nine thousand, eight hundred eighty-four".