129696879 has 32 divisors (see below), whose sum is σ = 190794240. Its totient is φ = 77885568.

The previous prime is 129696863. The next prime is 129696881. The reversal of 129696879 is 978696921.

It is not a de Polignac number, because 129696879 - 2⁴ = 129696863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129696979) 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, 333217 + ... + 333605.

It is an arithmetic number, because the mean of its divisors is an integer number (5962320).

Almost surely, 2^129696879 is an apocalyptic number.

129696879 is a deficient number, since it is larger than the sum of its proper divisors (61097361).

129696879 is a wasteful number, since it uses less digits than its factorization.

129696879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591.

The product of its digits is 2939328, while the sum is 57.

The square root of 129696879 is about 11388.4537580832. The cubic root of 129696879 is about 506.1856648622.

The spelling of 129696879 in words is "one hundred twenty-nine million, six hundred ninety-six thousand, eight hundred seventy-nine".