18397901940 has 96 divisors (see below), whose sum is σ = 58640633856. Its totient is φ = 4266176640.

The previous prime is 18397901939. The next prime is 18397901971. The reversal of 18397901940 is 4910979381.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 590812 + ... + 621171.

It is an arithmetic number, because the mean of its divisors is an integer number (610839936).

Almost surely, 2^18397901940 is an apocalyptic number.

18397901940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18397901940 is an abundant number, since it is smaller than the sum of its proper divisors (40242731916).

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

18397901940 is a wasteful number, since it uses less digits than its factorization.

18397901940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212029 (or 1212027 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 51.

The spelling of 18397901940 in words is "eighteen billion, three hundred ninety-seven million, nine hundred one thousand, nine hundred forty".