129721732 has 48 divisors (see below), whose sum is σ = 269516800. Its totient is φ = 53460000.

The previous prime is 129721723. The next prime is 129721783. The reversal of 129721732 is 237127921.

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, 172357 + ... + 173107.

Almost surely, 2^129721732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129721732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134758400).

129721732 is an abundant number, since it is smaller than the sum of its proper divisors (139795068).

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

129721732 is a wasteful number, since it uses less digits than its factorization.

129721732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 990 counting only the distinct ones).

The product of its digits is 10584, while the sum is 34.

The square root of 129721732 is about 11389.5448548219. The cubic root of 129721732 is about 506.2179951926.

The spelling of 129721732 in words is "one hundred twenty-nine million, seven hundred twenty-one thousand, seven hundred thirty-two".