18938928 has 40 divisors (see below), whose sum is σ = 49082176. Its totient is φ = 6292800.

The previous prime is 18938921. The next prime is 18938947. The reversal of 18938928 is 82983981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (18938921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27063 + ... + 27753.

Almost surely, 2^18938928 is an apocalyptic number.

It is an amenable number.

18938928 is an abundant number, since it is smaller than the sum of its proper divisors (30143248).

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

18938928 is a wasteful number, since it uses less digits than its factorization.

18938928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1267 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 18938928 is about 4351.8878662024. The cubic root of 18938928 is about 266.5539551449.

The spelling of 18938928 in words is "eighteen million, nine hundred thirty-eight thousand, nine hundred twenty-eight".