172307972 has 6 divisors (see below), whose sum is σ = 301538958. Its totient is φ = 86153984.

The previous prime is 172307957. The next prime is 172308007. The reversal of 172307972 is 279703271.

It can be written as a sum of positive squares in only one way, i.e., 111218116 + 61089856 = 10546^2 + 7816^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21538493 + ... + 21538500.

It is an arithmetic number, because the mean of its divisors is an integer number (50256493).

Almost surely, 2^172307972 is an apocalyptic number.

It is an amenable number.

172307972 is a deficient number, since it is larger than the sum of its proper divisors (129230986).

172307972 is a wasteful number, since it uses less digits than its factorization.

172307972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43076997 (or 43076995 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 172307972 is about 13126.6131199179. The cubic root of 172307972 is about 556.4615019972.

The spelling of 172307972 in words is "one hundred seventy-two million, three hundred seven thousand, nine hundred seventy-two".