19934172972 has 72 divisors (see below), whose sum is σ = 57640346400. Its totient is φ = 5690262528.

The previous prime is 19934172961. The next prime is 19934172977. The reversal of 19934172972 is 27927143991.

It is a happy number.

19934172972 is a `hidden beast` number, since 1 + 9 + 9 + 341 + 7 + 297 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (19934172977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243804 + ... + 315132.

Almost surely, 2^19934172972 is an apocalyptic number.

19934172972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19934172972 is an abundant number, since it is smaller than the sum of its proper divisors (37706173428).

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

19934172972 is a wasteful number, since it uses less digits than its factorization.

19934172972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72455 (or 72450 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The spelling of 19934172972 in words is "nineteen billion, nine hundred thirty-four million, one hundred seventy-two thousand, nine hundred seventy-two".