129706920 has 480 divisors, whose sum is σ = 546242400. Its totient is φ = 27433728.

The previous prime is 129706859. The next prime is 129706921. The reversal of 129706920 is 29607921.

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 (129706921) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3016419 + ... + 3016461.

It is an arithmetic number, because the mean of its divisors is an integer number (1138005).

Almost surely, 2^129706920 is an apocalyptic number.

129706920 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 129706920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273121200).

129706920 is an abundant number, since it is smaller than the sum of its proper divisors (416535480).

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

129706920 is a wasteful number, since it uses less digits than its factorization.

129706920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 129706920 is about 11388.8945907845. The cubic root of 129706920 is about 506.1987273176.

The spelling of 129706920 in words is "one hundred twenty-nine million, seven hundred six thousand, nine hundred twenty".