19115972 has 6 divisors (see below), whose sum is σ = 33452958. Its totient is φ = 9557984.

The previous prime is 19115923. The next prime is 19115977. The reversal of 19115972 is 27951191.

It can be written as a sum of positive squares in only one way, i.e., 17172736 + 1943236 = 4144^2 + 1394^2 .

It is not an unprimeable number, because it can be changed into a prime (19115977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2389493 + ... + 2389500.

It is an arithmetic number, because the mean of its divisors is an integer number (5575493).

Almost surely, 2^19115972 is an apocalyptic number.

It is an amenable number.

19115972 is a deficient number, since it is larger than the sum of its proper divisors (14336986).

19115972 is a wasteful number, since it uses less digits than its factorization.

19115972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4778997 (or 4778995 counting only the distinct ones).

The product of its digits is 5670, while the sum is 35.

The square root of 19115972 is about 4372.1816064752. The cubic root of 19115972 is about 267.3819760589.

The spelling of 19115972 in words is "nineteen million, one hundred fifteen thousand, nine hundred seventy-two".