172215939 has 24 divisors (see below), whose sum is σ = 268040448. Its totient is φ = 98066640.

The previous prime is 172215913. The next prime is 172215941. The reversal of 172215939 is 939512271.

It is not a de Polignac number, because 172215939 - 2⁵ = 172215907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172215897 and 172215906.

It is not an unprimeable number, because it can be changed into a prime (172215959) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 43834 + ... + 47600.

It is an arithmetic number, because the mean of its divisors is an integer number (11168352).

Almost surely, 2^172215939 is an apocalyptic number.

172215939 is a deficient number, since it is larger than the sum of its proper divisors (95824509).

172215939 is a wasteful number, since it uses less digits than its factorization.

172215939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095 (or 4088 counting only the distinct ones).

The product of its digits is 34020, while the sum is 39.

The square root of 172215939 is about 13123.1070634968. The cubic root of 172215939 is about 556.3624120916.

The spelling of 172215939 in words is "one hundred seventy-two million, two hundred fifteen thousand, nine hundred thirty-nine".