172129239 has 32 divisors (see below), whose sum is σ = 264960000. Its totient is φ = 110309472.

The previous prime is 172129187. The next prime is 172129247. The reversal of 172129239 is 932921271.

It is not a de Polignac number, because 172129239 - 2¹² = 172125143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172129249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287062 + ... + 287660.

It is an arithmetic number, because the mean of its divisors is an integer number (8280000).

Almost surely, 2^172129239 is an apocalyptic number.

172129239 is a deficient number, since it is larger than the sum of its proper divisors (92830761).

172129239 is a wasteful number, since it uses less digits than its factorization.

172129239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 998 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 172129239 is about 13119.8033140745. The cubic root of 172129239 is about 556.2690318111.

The spelling of 172129239 in words is "one hundred seventy-two million, one hundred twenty-nine thousand, two hundred thirty-nine".