172170812 has 12 divisors (see below), whose sum is σ = 328689816. Its totient is φ = 78259440.

The previous prime is 172170809. The next prime is 172170827. The reversal of 172170812 is 218071271.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1956443 + ... + 1956530.

It is an arithmetic number, because the mean of its divisors is an integer number (27390818).

Almost surely, 2^172170812 is an apocalyptic number.

It is an amenable number.

172170812 is a deficient number, since it is larger than the sum of its proper divisors (156519004).

172170812 is a wasteful number, since it uses less digits than its factorization.

172170812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912988 (or 3912986 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 172170812 is about 13121.3875790634. The cubic root of 172170812 is about 556.3138119446.

The spelling of 172170812 in words is "one hundred seventy-two million, one hundred seventy thousand, eight hundred twelve".