129508900 has 18 divisors (see below), whose sum is σ = 281034530. Its totient is φ = 51803520.

The previous prime is 129508877. The next prime is 129508903. The reversal of 129508900 is 9805921.

It can be written as a sum of positive squares in 3 ways, for example, as 1004004 + 128504896 = 1002^2 + 11336^2 .

It is not an unprimeable number, because it can be changed into a prime (129508903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 647445 + ... + 647644.

Almost surely, 2^129508900 is an apocalyptic number.

129508900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129508900 is an abundant number, since it is smaller than the sum of its proper divisors (151525630).

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

129508900 is a wasteful number, since it uses less digits than its factorization.

129508900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295103 (or 1295096 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 129508900 is about 11380.1977135725. The cubic root of 129508900 is about 505.9409962080.

The spelling of 129508900 in words is "one hundred twenty-nine million, five hundred eight thousand, nine hundred".