172138422 has 8 divisors (see below), whose sum is σ = 344276856. Its totient is φ = 57379472.

The previous prime is 172138397. The next prime is 172138433. The reversal of 172138422 is 224831271.

It is a sphenic number, since it is the product of 3 distinct primes.

172138422 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 172138422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14344863 + ... + 14344874.

It is an arithmetic number, because the mean of its divisors is an integer number (43034607).

Almost surely, 2^172138422 is an apocalyptic number.

172138422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

172138422 is a wasteful number, since it uses less digits than its factorization.

172138422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28689742.

The product of its digits is 5376, while the sum is 30.

The square root of 172138422 is about 13120.1532765437. The cubic root of 172138422 is about 556.2789238505.

Adding to 172138422 its reverse (224831271), we get a palindrome (396969693).

The spelling of 172138422 in words is "one hundred seventy-two million, one hundred thirty-eight thousand, four hundred twenty-two".