18397690972 has 48 divisors (see below), whose sum is σ = 34599126240. Its totient is φ = 8528689152.

The previous prime is 18397690957. The next prime is 18397690979. The reversal of 18397690972 is 27909679381.

It is a self number, because there is not a number n which added to its sum of digits gives 18397690972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397690979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5304783 + ... + 5308249.

It is an arithmetic number, because the mean of its divisors is an integer number (720815130).

Almost surely, 2^18397690972 is an apocalyptic number.

It is an amenable number.

18397690972 is a deficient number, since it is larger than the sum of its proper divisors (16201435268).

18397690972 is a wasteful number, since it uses less digits than its factorization.

18397690972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630 (or 4628 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 18397690972 in words is "eighteen billion, three hundred ninety-seven million, six hundred ninety thousand, nine hundred seventy-two".