129920370 has 64 divisors (see below), whose sum is σ = 319904640. Its totient is φ = 33758208.

The previous prime is 129920359. The next prime is 129920383. The reversal of 129920370 is 73029921.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218794 + ... + 219386.

It is an arithmetic number, because the mean of its divisors is an integer number (4998510).

Almost surely, 2^129920370 is an apocalyptic number.

129920370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129920370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159952320).

129920370 is an abundant number, since it is smaller than the sum of its proper divisors (189984270).

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

129920370 is a wasteful number, since it uses less digits than its factorization.

129920370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 129920370 is about 11398.2617095766. The cubic root of 129920370 is about 506.4762476002.

The spelling of 129920370 in words is "one hundred twenty-nine million, nine hundred twenty thousand, three hundred seventy".