129503872 has 16 divisors (see below), whose sum is σ = 257996250. Its totient is φ = 64751872.

The previous prime is 129503861. The next prime is 129503887. The reversal of 129503872 is 278305921.

It can be written as a sum of positive squares in only one way, i.e., 106998336 + 22505536 = 10344^2 + 4744^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505747 + ... + 506002.

Almost surely, 2^129503872 is an apocalyptic number.

It is an amenable number.

129503872 is a deficient number, since it is larger than the sum of its proper divisors (128492378).

129503872 is an equidigital number, since it uses as much as digits as its factorization.

129503872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011763 (or 1011751 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 129503872 is about 11379.9768013823. The cubic root of 129503872 is about 505.9344486419.

The spelling of 129503872 in words is "one hundred twenty-nine million, five hundred three thousand, eight hundred seventy-two".