129908321 has 8 divisors (see below), whose sum is σ = 135429888. Its totient is φ = 124470000.

The previous prime is 129908299. The next prime is 129908323. The reversal of 129908321 is 123809921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129908321 - 2⁶ = 129908257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129908323) 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 7 ways as a sum of consecutive naturals, for example, 17615 + ... + 23876.

It is an arithmetic number, because the mean of its divisors is an integer number (16928736).

Almost surely, 2^129908321 is an apocalyptic number.

It is an amenable number.

129908321 is a deficient number, since it is larger than the sum of its proper divisors (5521567).

129908321 is a wasteful number, since it uses less digits than its factorization.

129908321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41623.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 129908321 is about 11397.7331518158. The cubic root of 129908321 is about 506.4605900068.

The spelling of 129908321 in words is "one hundred twenty-nine million, nine hundred eight thousand, three hundred twenty-one".