172912372 has 12 divisors (see below), whose sum is σ = 320396580. Its totient is φ = 81370496.

The previous prime is 172912357. The next prime is 172912373. The reversal of 172912372 is 273219271.

It can be written as a sum of positive squares in 2 ways, for example, as 75968656 + 96943716 = 8716^2 + 9846^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172912373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1271347 + ... + 1271482.

It is an arithmetic number, because the mean of its divisors is an integer number (26699715).

Almost surely, 2^172912372 is an apocalyptic number.

It is an amenable number.

172912372 is a deficient number, since it is larger than the sum of its proper divisors (147484208).

172912372 is a wasteful number, since it uses less digits than its factorization.

172912372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542850 (or 2542848 counting only the distinct ones).

The product of its digits is 10584, while the sum is 34.

The square root of 172912372 is about 13149.6148993041. The cubic root of 172912372 is about 557.1113710518. Note that the first 3 decimals are identical.

The spelling of 172912372 in words is "one hundred seventy-two million, nine hundred twelve thousand, three hundred seventy-two".