19397925172 has 12 divisors (see below), whose sum is σ = 33980630656. Its totient is φ = 9689173560.

The previous prime is 19397925149. The next prime is 19397925221. The reversal of 19397925172 is 27152979391.

It is a super-2 number, since 2×19397925172² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 2442798 + ... + 2450725.

Almost surely, 2^19397925172 is an apocalyptic number.

It is an amenable number.

19397925172 is a deficient number, since it is larger than the sum of its proper divisors (14582705484).

19397925172 is a wasteful number, since it uses less digits than its factorization.

19397925172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894518 (or 4894516 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 55.

The spelling of 19397925172 in words is "nineteen billion, three hundred ninety-seven million, nine hundred twenty-five thousand, one hundred seventy-two".