129439338 has 32 divisors (see below), whose sum is σ = 296290176. Its totient is φ = 36929088.

The previous prime is 129439327. The next prime is 129439339. The reversal of 129439338 is 833934921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 129439338.

It is not an unprimeable number, because it can be changed into a prime (129439339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34020 + ... + 37632.

It is an arithmetic number, because the mean of its divisors is an integer number (9259068).

Almost surely, 2^129439338 is an apocalyptic number.

129439338 is an abundant number, since it is smaller than the sum of its proper divisors (166850838).

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

129439338 is a wasteful number, since it uses less digits than its factorization.

129439338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478.

The product of its digits is 139968, while the sum is 42.

The square root of 129439338 is about 11377.1410292744. The cubic root of 129439338 is about 505.8503960751.

The spelling of 129439338 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, three hundred thirty-eight".