172772397 has 24 divisors (see below), whose sum is σ = 286665600. Its totient is φ = 98223840.

The previous prime is 172772387. The next prime is 172772417. The reversal of 172772397 is 793277271.

It is not a de Polignac number, because 172772397 - 2⁶ = 172772333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172772357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5647 + ... + 19427.

It is an arithmetic number, because the mean of its divisors is an integer number (11944400).

Almost surely, 2^172772397 is an apocalyptic number.

It is an amenable number.

172772397 is a deficient number, since it is larger than the sum of its proper divisors (113893203).

172772397 is a wasteful number, since it uses less digits than its factorization.

172772397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13993 (or 13990 counting only the distinct ones).

The product of its digits is 259308, while the sum is 45.

The square root of 172772397 is about 13144.2914225149. The cubic root of 172772397 is about 556.9610006356.

The spelling of 172772397 in words is "one hundred seventy-two million, seven hundred seventy-two thousand, three hundred ninety-seven".