129959724 has 12 divisors (see below), whose sum is σ = 303239384. Its totient is φ = 43319904.

The previous prime is 129959723. The next prime is 129959741. The reversal of 129959724 is 427959921.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (129959723) 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, 5414977 + ... + 5415000.

Almost surely, 2^129959724 is an apocalyptic number.

It is an amenable number.

129959724 is an abundant number, since it is smaller than the sum of its proper divisors (173279660).

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

129959724 is a wasteful number, since it uses less digits than its factorization.

129959724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10829984 (or 10829982 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 129959724 is about 11399.9878947304. The cubic root of 129959724 is about 506.5273811114.

The spelling of 129959724 in words is "one hundred twenty-nine million, nine hundred fifty-nine thousand, seven hundred twenty-four".