172171992 has 32 divisors (see below), whose sum is σ = 431120880. Its totient is φ = 57298560.

The previous prime is 172171981. The next prime is 172172017. The reversal of 172171992 is 299171271.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 172171992.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10438 + ... + 21290.

Almost surely, 2^172171992 is an apocalyptic number.

172171992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172171992 is an abundant number, since it is smaller than the sum of its proper divisors (258948888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172171992 is a wasteful number, since it uses less digits than its factorization.

172171992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11523 (or 11519 counting only the distinct ones).

The product of its digits is 15876, while the sum is 39.

The square root of 172171992 is about 13121.4325437431. The cubic root of 172171992 is about 556.3150828700.

The spelling of 172171992 in words is "one hundred seventy-two million, one hundred seventy-one thousand, nine hundred ninety-two".