129943128 has 64 divisors (see below), whose sum is σ = 390816000. Its totient is φ = 35171712.

The previous prime is 129943097. The next prime is 129943133. The reversal of 129943128 is 821349921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17163 + ... + 23546.

It is an arithmetic number, because the mean of its divisors is an integer number (6106500).

Almost surely, 2^129943128 is an apocalyptic number.

It is an amenable number.

129943128 is an abundant number, since it is smaller than the sum of its proper divisors (260872872).

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

129943128 is a wasteful number, since it uses less digits than its factorization.

129943128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40744 (or 40740 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 129943128 is about 11399.2599759809. The cubic root of 129943128 is about 506.5058188252.

The spelling of 129943128 in words is "one hundred twenty-nine million, nine hundred forty-three thousand, one hundred twenty-eight".