129744900 has 54 divisors (see below), whose sum is σ = 406681002. Its totient is φ = 34598400.

The previous prime is 129744859. The next prime is 129744907. The reversal of 129744900 is 9447921.

It can be written as a sum of positive squares in 3 ways, for example, as 4260096 + 125484804 = 2064^2 + 11202^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (129744907) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71181 + ... + 72980.

Almost surely, 2^129744900 is an apocalyptic number.

129744900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129744900 is an abundant number, since it is smaller than the sum of its proper divisors (276936102).

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

129744900 is a wasteful number, since it uses less digits than its factorization.

129744900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144181 (or 144171 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 129744900 is about 11390.5618825412. The cubic root of 129744900 is about 506.2481298513.

The spelling of 129744900 in words is "one hundred twenty-nine million, seven hundred forty-four thousand, nine hundred".