129138108 has 48 divisors (see below), whose sum is σ = 329581056. Its totient is φ = 39029760.

The previous prime is 129138101. The next prime is 129138133. The reversal of 129138108 is 801831921.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129138101) 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, 60060 + ... + 62172.

It is an arithmetic number, because the mean of its divisors is an integer number (6866272).

Almost surely, 2^129138108 is an apocalyptic number.

It is an amenable number.

129138108 is an abundant number, since it is smaller than the sum of its proper divisors (200442948).

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

129138108 is a wasteful number, since it uses less digits than its factorization.

129138108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2592 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 129138108 is about 11363.8949308765. The cubic root of 129138108 is about 505.4576878668.

The spelling of 129138108 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, one hundred eight".