129368879 has 4 divisors (see below), whose sum is σ = 129790584. Its totient is φ = 128947176.

The previous prime is 129368851. The next prime is 129368903. The reversal of 129368879 is 978863921.

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 129368879 - 2²⁰ = 128320303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129368879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129368809) 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, 210392 + ... + 211005.

It is an arithmetic number, because the mean of its divisors is an integer number (32447646).

Almost surely, 2^129368879 is an apocalyptic number.

129368879 is a deficient number, since it is larger than the sum of its proper divisors (421705).

129368879 is an equidigital number, since it uses as much as digits as its factorization.

129368879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421704.

The product of its digits is 1306368, while the sum is 53.

The square root of 129368879 is about 11374.0440917028. The cubic root of 129368879 is about 505.7585945599.

The spelling of 129368879 in words is "one hundred twenty-nine million, three hundred sixty-eight thousand, eight hundred seventy-nine".