129944400 has 60 divisors (see below), whose sum is σ = 416259072. Its totient is φ = 34651520.

The previous prime is 129944383. The next prime is 129944429. The reversal of 129944400 is 4449921.

It is a tau number, because it is divible by the number of its divisors (60).

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, 52944 + ... + 55343.

Almost surely, 2^129944400 is an apocalyptic number.

129944400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129944400 is an abundant number, since it is smaller than the sum of its proper divisors (286314672).

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

129944400 is a wasteful number, since it uses less digits than its factorization.

129944400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108308 (or 108297 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 129944400 is about 11399.3157689398. The cubic root of 129944400 is about 506.5074715311.

The spelling of 129944400 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, four hundred".