129972432 has 40 divisors (see below), whose sum is σ = 347343840. Its totient is φ = 41829760.

The previous prime is 129972421. The next prime is 129972433. The reversal of 129972432 is 234279921.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129972433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45294 + ... + 48077.

It is an arithmetic number, because the mean of its divisors is an integer number (8683596).

Almost surely, 2^129972432 is an apocalyptic number.

129972432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129972432 is an abundant number, since it is smaller than the sum of its proper divisors (217371408).

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

129972432 is a wasteful number, since it uses less digits than its factorization.

129972432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93411 (or 93405 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 129972432 is about 11400.5452501185. The cubic root of 129972432 is about 506.5438906883.

The spelling of 129972432 in words is "one hundred twenty-nine million, nine hundred seventy-two thousand, four hundred thirty-two".