129870992 has 20 divisors (see below), whose sum is σ = 251936256. Its totient is φ = 64855200.

The previous prime is 129870971. The next prime is 129871031. The reversal of 129870992 is 299078921.

It is a happy number.

It is a Smith number, since the sum of its digits (47) 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 in 3 ways as a sum of consecutive naturals, for example, 9617 + ... + 18767.

Almost surely, 2^129870992 is an apocalyptic number.

It is an amenable number.

129870992 is a deficient number, since it is larger than the sum of its proper divisors (122065264).

129870992 is an equidigital number, since it uses as much as digits as its factorization.

129870992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10046 (or 10040 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 129870992 is about 11396.0954716956. The cubic root of 129870992 is about 506.4120750789.

The spelling of 129870992 in words is "one hundred twenty-nine million, eight hundred seventy thousand, nine hundred ninety-two".