19388475172 has 18 divisors (see below), whose sum is σ = 37294774454. Its totient is φ = 8812943040.

The previous prime is 19388475151. The next prime is 19388475217. The reversal of 19388475172 is 27157488391.

It can be written as a sum of positive squares in only one way, i.e., 11044748836 + 8343726336 = 105094^2 + 91344^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20028933 + ... + 20029900.

Almost surely, 2^19388475172 is an apocalyptic number.

It is an amenable number.

19388475172 is a deficient number, since it is larger than the sum of its proper divisors (17906299282).

19388475172 is a wasteful number, since it uses less digits than its factorization.

19388475172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40058859 (or 40058846 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 55.

The spelling of 19388475172 in words is "nineteen billion, three hundred eighty-eight million, four hundred seventy-five thousand, one hundred seventy-two".