129672400 has 120 divisors (see below), whose sum is σ = 366164064. Its totient is φ = 43507200.

The previous prime is 129672317. The next prime is 129672401. The reversal of 129672400 is 4276921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129672401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56067 + ... + 58333.

Almost surely, 2^129672400 is an apocalyptic number.

129672400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129672400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183082032).

129672400 is an abundant number, since it is smaller than the sum of its proper divisors (236491664).

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

129672400 is a wasteful number, since it uses less digits than its factorization.

129672400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 2298 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 129672400 is about 11387.3789785007. The cubic root of 129672400 is about 506.1538170166.

The spelling of 129672400 in words is "one hundred twenty-nine million, six hundred seventy-two thousand, four hundred".