129908939 has 4 divisors (see below), whose sum is σ = 131368680. Its totient is φ = 128449200.

The previous prime is 129908929. The next prime is 129908953. The reversal of 129908939 is 939809921.

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 129908939 - 2⁴ = 129908923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129908929) 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, 729737 + ... + 729914.

It is an arithmetic number, because the mean of its divisors is an integer number (32842170).

Almost surely, 2^129908939 is an apocalyptic number.

129908939 is a deficient number, since it is larger than the sum of its proper divisors (1459741).

129908939 is an equidigital number, since it uses as much as digits as its factorization.

129908939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459740.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 129908939 is about 11397.7602624375. The cubic root of 129908939 is about 506.4613931172.

The spelling of 129908939 in words is "one hundred twenty-nine million, nine hundred eight thousand, nine hundred thirty-nine".