129108940 has 48 divisors (see below), whose sum is σ = 278669664. Its totient is φ = 50227200.

The previous prime is 129108923. The next prime is 129108949. The reversal of 129108940 is 49801921.

It is a junction number, because it is equal to n+sod(n) for n = 129108896 and 129108905.

It is not an unprimeable number, because it can be changed into a prime (129108949) 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, 117795 + ... + 118885.

It is an arithmetic number, because the mean of its divisors is an integer number (5805618).

Almost surely, 2^129108940 is an apocalyptic number.

129108940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129108940 is an abundant number, since it is smaller than the sum of its proper divisors (149560724).

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

129108940 is a wasteful number, since it uses less digits than its factorization.

129108940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 129108940 is about 11362.6114956026. The cubic root of 129108940 is about 505.4196296457.

The spelling of 129108940 in words is "one hundred twenty-nine million, one hundred eight thousand, nine hundred forty".