129839960 has 64 divisors (see below), whose sum is σ = 304430400. Its totient is φ = 49778176.

The previous prime is 129839959. The next prime is 129839987. The reversal of 129839960 is 69938921.

129839960 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200357 + ... + 201003.

It is an arithmetic number, because the mean of its divisors is an integer number (4756725).

Almost surely, 2^129839960 is an apocalyptic number.

129839960 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 129839960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152215200).

129839960 is an abundant number, since it is smaller than the sum of its proper divisors (174590440).

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

129839960 is a wasteful number, since it uses less digits than its factorization.

129839960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 129839960 is about 11394.7338713987. The cubic root of 129839960 is about 506.3717370196.

The spelling of 129839960 in words is "one hundred twenty-nine million, eight hundred thirty-nine thousand, nine hundred sixty".