129891744 has 36 divisors (see below), whose sum is σ = 369380466. Its totient is φ = 43297152.

The previous prime is 129891737. The next prime is 129891779. The reversal of 129891744 is 447198921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 86490000 + 43401744 = 9300^2 + 6588^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 129891744.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225219 + ... + 225794.

Almost surely, 2^129891744 is an apocalyptic number.

It is an amenable number.

129891744 is an abundant number, since it is smaller than the sum of its proper divisors (239488722).

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

129891744 is a wasteful number, since it uses less digits than its factorization.

129891744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451029 (or 451018 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 129891744 is about 11397.0059226097. The cubic root of 129891744 is about 506.4390467260.

The spelling of 129891744 in words is "one hundred twenty-nine million, eight hundred ninety-one thousand, seven hundred forty-four".