129941728 has 72 divisors (see below), whose sum is σ = 301644000. Its totient is φ = 54931968.

The previous prime is 129941723. The next prime is 129941737. The reversal of 129941728 is 827149921.

It is a happy number.

Its product of digits (72576) is a multiple of the sum of its prime factors (1152).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129941723) 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, 123348 + ... + 124396.

It is an arithmetic number, because the mean of its divisors is an integer number (4189500).

Almost surely, 2^129941728 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 129941728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150822000).

129941728 is an abundant number, since it is smaller than the sum of its proper divisors (171702272).

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

129941728 is a wasteful number, since it uses less digits than its factorization.

129941728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 1137 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 129941728 is about 11399.1985683205. The cubic root of 129941728 is about 506.5039997969.

The spelling of 129941728 in words is "one hundred twenty-nine million, nine hundred forty-one thousand, seven hundred twenty-eight".