129923400 has 96 divisors (see below), whose sum is σ = 408009600. Its totient is φ = 34195200.

The previous prime is 129923377. The next prime is 129923407. The reversal of 129923400 is 4329921.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (129923407) 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, 46030 + ... + 48770.

It is an arithmetic number, because the mean of its divisors is an integer number (4250100).

Almost surely, 2^129923400 is an apocalyptic number.

129923400 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 129923400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204004800).

129923400 is an abundant number, since it is smaller than the sum of its proper divisors (278086200).

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

129923400 is a wasteful number, since it uses less digits than its factorization.

129923400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2830 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 129923400 is about 11398.3946238056. The cubic root of 129923400 is about 506.4801849122.

The spelling of 129923400 in words is "one hundred twenty-nine million, nine hundred twenty-three thousand, four hundred".