129478432 has 24 divisors (see below), whose sum is σ = 256038300. Its totient is φ = 64452864.

The previous prime is 129478411. The next prime is 129478439. The reversal of 129478432 is 234874921.

It can be written as a sum of positive squares in 2 ways, for example, as 128232976 + 1245456 = 11324^2 + 1116^2 .

It is not an unprimeable number, because it can be changed into a prime (129478439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507 + ... + 16162.

Almost surely, 2^129478432 is an apocalyptic number.

It is an amenable number.

129478432 is a deficient number, since it is larger than the sum of its proper divisors (126559868).

129478432 is a wasteful number, since it uses less digits than its factorization.

129478432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17908 (or 17900 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 129478432 is about 11378.8589937656. The cubic root of 129478432 is about 505.9013175469.

The spelling of 129478432 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, four hundred thirty-two".