129920708 has 12 divisors (see below), whose sum is σ = 239327760. Its totient is φ = 61541352.

The previous prime is 129920701. The next prime is 129920717. The reversal of 129920708 is 807029921.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (129920701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854666 + ... + 854817.

It is an arithmetic number, because the mean of its divisors is an integer number (19943980).

Almost surely, 2^129920708 is an apocalyptic number.

It is an amenable number.

129920708 is a deficient number, since it is larger than the sum of its proper divisors (109407052).

129920708 is a wasteful number, since it uses less digits than its factorization.

129920708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709506 (or 1709504 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 129920708 is about 11398.2765363892. The cubic root of 129920708 is about 506.4766868149.

The spelling of 129920708 in words is "one hundred twenty-nine million, nine hundred twenty thousand, seven hundred eight".