18493984972 has 12 divisors (see below), whose sum is σ = 32373397840. Its totient is φ = 9244442736.

The previous prime is 18493984909. The next prime is 18493984981. The reversal of 18493984972 is 27948939481.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621072 + ... + 650167.

Almost surely, 2^18493984972 is an apocalyptic number.

It is an amenable number.

18493984972 is a deficient number, since it is larger than the sum of its proper divisors (13879412868).

18493984972 is a wasteful number, since it uses less digits than its factorization.

18493984972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274880 (or 1274878 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 64.

The spelling of 18493984972 in words is "eighteen billion, four hundred ninety-three million, nine hundred eighty-four thousand, nine hundred seventy-two".