129625920 has 168 divisors, whose sum is σ = 462649824. Its totient is φ = 34546176.

The previous prime is 129625897. The next prime is 129625921. The reversal of 129625920 is 29526921.

It is a happy number.

129625920 is a `hidden beast` number, since 1 + 2 + 9 + 62 + 592 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129625921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76927 + ... + 78593.

It is an arithmetic number, because the mean of its divisors is an integer number (2753868).

Almost surely, 2^129625920 is an apocalyptic number.

129625920 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 129625920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231324912).

129625920 is an abundant number, since it is smaller than the sum of its proper divisors (333023904).

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

129625920 is an equidigital number, since it uses as much as digits as its factorization.

129625920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 129625920 is about 11385.3379396485. The cubic root of 129625920 is about 506.0933342388.

The spelling of 129625920 in words is "one hundred twenty-nine million, six hundred twenty-five thousand, nine hundred twenty".