18923928 has 16 divisors (see below), whose sum is σ = 47309880. Its totient is φ = 6307968.

The previous prime is 18923911. The next prime is 18923929. The reversal of 18923928 is 82932981.

It is a self number, because there is not a number n which added to its sum of digits gives 18923928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18923929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394225 + ... + 394272.

Almost surely, 2^18923928 is an apocalyptic number.

It is an amenable number.

18923928 is an abundant number, since it is smaller than the sum of its proper divisors (28385952).

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

18923928 is a wasteful number, since it uses less digits than its factorization.

18923928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788506 (or 788502 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 18923928 is about 4350.1641348345. The cubic root of 18923928 is about 266.4835645827.

The spelling of 18923928 in words is "eighteen million, nine hundred twenty-three thousand, nine hundred twenty-eight".