129908238 has 16 divisors (see below), whose sum is σ = 260499456. Its totient is φ = 43188920.

The previous prime is 129908189. The next prime is 129908257. The reversal of 129908238 is 832809921.

It is a self number, because there is not a number n which added to its sum of digits gives 129908238.

It is a congruent number.

It is an unprimeable number.

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, 25968 + ... + 30563.

It is an arithmetic number, because the mean of its divisors is an integer number (16281216).

Almost surely, 2^129908238 is an apocalyptic number.

129908238 is an abundant number, since it is smaller than the sum of its proper divisors (130591218).

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

129908238 is a wasteful number, since it uses less digits than its factorization.

129908238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56919.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 129908238 is about 11397.7295107403. The cubic root of 129908238 is about 506.4604821456.

The spelling of 129908238 in words is "one hundred twenty-nine million, nine hundred eight thousand, two hundred thirty-eight".