129939179 has 4 divisors (see below), whose sum is σ = 129962280. Its totient is φ = 129916080.

The previous prime is 129939151. The next prime is 129939223. The reversal of 129939179 is 971939921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129939179 - 2⁸ = 129938923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129939379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984 + ... + 16394.

It is an arithmetic number, because the mean of its divisors is an integer number (32490570).

Almost surely, 2^129939179 is an apocalyptic number.

129939179 is a deficient number, since it is larger than the sum of its proper divisors (23101).

129939179 is an equidigital number, since it uses as much as digits as its factorization.

129939179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23100.

The product of its digits is 275562, while the sum is 50.

The square root of 129939179 is about 11399.0867616665. The cubic root of 129939179 is about 506.5006878325.

The spelling of 129939179 in words is "one hundred twenty-nine million, nine hundred thirty-nine thousand, one hundred seventy-nine".