129491724 has 12 divisors (see below), whose sum is σ = 302147384. Its totient is φ = 43163904.

The previous prime is 129491723. The next prime is 129491731. The reversal of 129491724 is 427194921.

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

It is not an unprimeable number, because it can be changed into a prime (129491723) 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, 5395477 + ... + 5395500.

Almost surely, 2^129491724 is an apocalyptic number.

It is an amenable number.

129491724 is an abundant number, since it is smaller than the sum of its proper divisors (172655660).

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

129491724 is a wasteful number, since it uses less digits than its factorization.

129491724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10790984 (or 10790982 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 129491724 is about 11379.4430443673. The cubic root of 129491724 is about 505.9186285645.

The spelling of 129491724 in words is "one hundred twenty-nine million, four hundred ninety-one thousand, seven hundred twenty-four".