129885992 has 8 divisors (see below), whose sum is σ = 243536250. Its totient is φ = 64942992.

The previous prime is 129885989. The next prime is 129886027. The reversal of 129885992 is 299588921.

It can be written as a sum of positive squares in only one way, i.e., 122190916 + 7695076 = 11054^2 + 2774^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8117867 + ... + 8117882.

Almost surely, 2^129885992 is an apocalyptic number.

It is an amenable number.

129885992 is a deficient number, since it is larger than the sum of its proper divisors (113650258).

129885992 is a wasteful number, since it uses less digits than its factorization.

129885992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16235755 (or 16235751 counting only the distinct ones).

The product of its digits is 933120, while the sum is 53.

The square root of 129885992 is about 11396.7535728382. The cubic root of 129885992 is about 506.4315710638.

The spelling of 129885992 in words is "one hundred twenty-nine million, eight hundred eighty-five thousand, nine hundred ninety-two".