129999992 has 16 divisors (see below), whose sum is σ = 245099400. Its totient is φ = 64640160.

The previous prime is 129999983. The next prime is 129999997. The reversal of 129999992 is 299999921.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 12 and 9999992 contains 129999992 itself.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129999997) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 43442 + ... + 46337.

Almost surely, 2^129999992 is an apocalyptic number.

It is an amenable number.

129999992 is a deficient number, since it is larger than the sum of its proper divisors (115099408).

129999992 is a wasteful number, since it uses less digits than its factorization.

129999992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89966 (or 89962 counting only the distinct ones).

The product of its digits is 2125764, while the sum is 59.

The square root of 129999992 is about 11401.7539001682. The cubic root of 129999992 is about 506.5796915187.

The spelling of 129999992 in words is "one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-two".