18421994928 has 40 divisors (see below), whose sum is σ = 47596937728. Its totient is φ = 6139789632.

The previous prime is 18421994917. The next prime is 18421994947. The reversal of 18421994928 is 82949912481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373401 + ... + 419847.

Almost surely, 2^18421994928 is an apocalyptic number.

It is an amenable number.

18421994928 is an abundant number, since it is smaller than the sum of its proper divisors (29174942800).

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

18421994928 is a wasteful number, since it uses less digits than its factorization.

18421994928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54721 (or 54715 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 57.

The spelling of 18421994928 in words is "eighteen billion, four hundred twenty-one million, nine hundred ninety-four thousand, nine hundred twenty-eight".