129251872 has 24 divisors (see below), whose sum is σ = 254719836. Its totient is φ = 64561152.

The previous prime is 129251849. The next prime is 129251887. The reversal of 129251872 is 278152921.

It can be written as a sum of positive squares in 2 ways, for example, as 122677776 + 6574096 = 11076^2 + 2564^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55728 + ... + 58000.

Almost surely, 2^129251872 is an apocalyptic number.

It is an amenable number.

129251872 is a deficient number, since it is larger than the sum of its proper divisors (125467964).

129251872 is a wasteful number, since it uses less digits than its factorization.

129251872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060 (or 4052 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 129251872 is about 11368.8993310698. The cubic root of 129251872 is about 505.6060716704.

The spelling of 129251872 in words is "one hundred twenty-nine million, two hundred fifty-one thousand, eight hundred seventy-two".