129908940 has 96 divisors (see below), whose sum is σ = 424617984. Its totient is φ = 29057280.

The previous prime is 129908929. The next prime is 129908953. The reversal of 129908940 is 49809921.

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

It is a junction number, because it is equal to n+sod(n) for n = 129908892 and 129908901.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16450 + ... + 23030.

It is an arithmetic number, because the mean of its divisors is an integer number (4423104).

Almost surely, 2^129908940 is an apocalyptic number.

129908940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129908940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212308992).

129908940 is an abundant number, since it is smaller than the sum of its proper divisors (294709044).

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

129908940 is a wasteful number, since it uses less digits than its factorization.

129908940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6647 (or 6645 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 129908940 is about 11397.7603063058. The cubic root of 129908940 is about 506.4613944167.

The spelling of 129908940 in words is "one hundred twenty-nine million, nine hundred eight thousand, nine hundred forty".