129920000 has 220 divisors, whose sum is σ = 383689680. Its totient is φ = 43008000.

The previous prime is 129919997. The next prime is 129920017. The reversal of 129920000 is 29921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4479986 + ... + 4480014.

It is an arithmetic number, because the mean of its divisors is an integer number (1744044).

Almost surely, 2^129920000 is an apocalyptic number.

129920000 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 129920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191844840).

129920000 is an abundant number, since it is smaller than the sum of its proper divisors (253769680).

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

129920000 is an frugal number, since it uses more digits than its factorization.

129920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 129920000 is about 11398.2454790200. The cubic root of 129920000 is about 506.4757668021.

Adding to 129920000 its reverse (29921), we get a palindrome (129949921).

The spelling of 129920000 in words is "one hundred twenty-nine million, nine hundred twenty thousand".