129408918 has 16 divisors (see below), whose sum is σ = 259062960. Its totient is φ = 43095456.

The previous prime is 129408901. The next prime is 129408941. The reversal of 129408918 is 819804921.

129408918 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 129408918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2953 + ... + 16356.

It is an arithmetic number, because the mean of its divisors is an integer number (16191435).

Almost surely, 2^129408918 is an apocalyptic number.

129408918 is an abundant number, since it is smaller than the sum of its proper divisors (129654042).

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

129408918 is a wasteful number, since it uses less digits than its factorization.

129408918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 129408918 is about 11375.8040594940. The cubic root of 129408918 is about 505.8107657358.

The spelling of 129408918 in words is "one hundred twenty-nine million, four hundred eight thousand, nine hundred eighteen".