129912120 has 256 divisors, whose sum is σ = 491904000. Its totient is φ = 30233088.

The previous prime is 129912077. The next prime is 129912131. The reversal of 129912120 is 21219921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 266517 + ... + 267003.

It is an arithmetic number, because the mean of its divisors is an integer number (1921500).

Almost surely, 2^129912120 is an apocalyptic number.

129912120 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 129912120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245952000).

129912120 is an abundant number, since it is smaller than the sum of its proper divisors (361991880).

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

129912120 is a wasteful number, since it uses less digits than its factorization.

129912120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 129912120 is about 11397.8998065433. The cubic root of 129912120 is about 506.4655268860.

The spelling of 129912120 in words is "one hundred twenty-nine million, nine hundred twelve thousand, one hundred twenty".