129945800 has 48 divisors (see below), whose sum is σ = 311884800. Its totient is φ = 50299200.

The previous prime is 129945779. The next prime is 129945817. The reversal of 129945800 is 8549921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4280 + ... + 16679.

It is an arithmetic number, because the mean of its divisors is an integer number (6497600).

Almost surely, 2^129945800 is an apocalyptic number.

129945800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129945800 is an abundant number, since it is smaller than the sum of its proper divisors (181939000).

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

129945800 is a wasteful number, since it uses less digits than its factorization.

129945800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21006 (or 20997 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 129945800 is about 11399.3771759689. The cubic root of 129945800 is about 506.5092905345.

The spelling of 129945800 in words is "one hundred twenty-nine million, nine hundred forty-five thousand, eight hundred".