129994920 has 192 divisors, whose sum is σ = 488255040. Its totient is φ = 29644800.

The previous prime is 129994897. The next prime is 129994927. The reversal of 129994920 is 29499921.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (129994927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66355 + ... + 68285.

It is an arithmetic number, because the mean of its divisors is an integer number (2542995).

Almost surely, 2^129994920 is an apocalyptic number.

129994920 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 129994920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244127520).

129994920 is an abundant number, since it is smaller than the sum of its proper divisors (358260120).

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

129994920 is a wasteful number, since it uses less digits than its factorization.

129994920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976 (or 1969 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 129994920 is about 11401.5314760781. The cubic root of 129994920 is about 506.5731032988.

The spelling of 129994920 in words is "one hundred twenty-nine million, nine hundred ninety-four thousand, nine hundred twenty".