129394720 has 96 divisors (see below), whose sum is σ = 376282368. Its totient is φ = 40946688.

The previous prime is 129394687. The next prime is 129394721. The reversal of 129394720 is 27493921.

It is a self number, because there is not a number n which added to its sum of digits gives 129394720.

It is not an unprimeable number, because it can be changed into a prime (129394721) 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, 10117 + ... + 19003.

It is an arithmetic number, because the mean of its divisors is an integer number (3919608).

Almost surely, 2^129394720 is an apocalyptic number.

129394720 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 129394720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188141184).

129394720 is an abundant number, since it is smaller than the sum of its proper divisors (246887648).

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

129394720 is a wasteful number, since it uses less digits than its factorization.

129394720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8922 (or 8914 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 129394720 is about 11375.1799985758. The cubic root of 129394720 is about 505.7922668461.

The spelling of 129394720 in words is "one hundred twenty-nine million, three hundred ninety-four thousand, seven hundred twenty".