129439408 has 20 divisors (see below), whose sum is σ = 286616080. Its totient is φ = 55473984.

The previous prime is 129439399. The next prime is 129439421. The reversal of 129439408 is 804934921.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577743 + ... + 577966.

It is an arithmetic number, because the mean of its divisors is an integer number (14330804).

Almost surely, 2^129439408 is an apocalyptic number.

It is an amenable number.

129439408 is an abundant number, since it is smaller than the sum of its proper divisors (157176672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129439408 is a wasteful number, since it uses less digits than its factorization.

129439408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155724 (or 1155718 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 129439408 is about 11377.1441056181. The cubic root of 129439408 is about 505.8504872621.

The spelling of 129439408 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, four hundred eight".