129992 has 8 divisors (see below), whose sum is σ = 243750. Its totient is φ = 64992.

The previous prime is 129971. The next prime is 130003. The reversal of 129992 is 299921.

It can be written as a sum of positive squares in only one way, i.e., 106276 + 23716 = 326^2 + 154^2 .

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

It is a fibodiv number, since the Fibonacci-like sequence with seeds 12 and 9992 contains 129992 itself.

It is an unprimeable number.

129992 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8117 + ... + 8132.

2¹²⁹⁹⁹² is an apocalyptic number.

It is an amenable number.

129992 is a deficient number, since it is larger than the sum of its proper divisors (113758).

129992 is a wasteful number, since it uses less digits than its factorization.

129992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16255 (or 16251 counting only the distinct ones).

The product of its digits is 2916, while the sum is 32.

The square root of 129992 is about 360.5440333718. The cubic root of 129992 is about 50.6569310318.

The spelling of 129992 in words is "one hundred twenty-nine thousand, nine hundred ninety-two".