129388032 has 120 divisors (see below), whose sum is σ = 382692024. Its totient is φ = 42061824.

The previous prime is 129388027. The next prime is 129388033. The reversal of 129388032 is 230883921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129388033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197818 + ... + 198470.

Almost surely, 2^129388032 is an apocalyptic number.

129388032 is a gapful number since it is divisible by the number (12) 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 129388032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191346012).

129388032 is an abundant number, since it is smaller than the sum of its proper divisors (253303992).

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

129388032 is an equidigital number, since it uses as much as digits as its factorization.

129388032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 129388032 is about 11374.8860214070. The cubic root of 129388032 is about 505.7835524334.

The spelling of 129388032 in words is "one hundred twenty-nine million, three hundred eighty-eight thousand, thirty-two".