129124900 has 18 divisors (see below), whose sum is σ = 280201250. Its totient is φ = 51649920.

The previous prime is 129124883. The next prime is 129124903. The reversal of 129124900 is 9421921.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2427364 + 126697536 = 1558^2 + 11256^2 .

It is not an unprimeable number, because it can be changed into a prime (129124903) 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, 645525 + ... + 645724.

Almost surely, 2^129124900 is an apocalyptic number.

129124900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129124900 is an abundant number, since it is smaller than the sum of its proper divisors (151076350).

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

129124900 is a wasteful number, since it uses less digits than its factorization.

129124900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291263 (or 1291256 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 129124900 is about 11363.3137772395. The cubic root of 129124900 is about 505.4404548624.

The spelling of 129124900 in words is "one hundred twenty-nine million, one hundred twenty-four thousand, nine hundred".