129729929 has 16 divisors (see below), whose sum is σ = 158054400. Its totient is φ = 104002704.

The previous prime is 129729923. The next prime is 129729937. The reversal of 129729929 is 929927921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129729929 - 2²⁴ = 112952713 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (129729923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4334 + ... + 16680.

It is an arithmetic number, because the mean of its divisors is an integer number (9878400).

Almost surely, 2^129729929 is an apocalyptic number.

129729929 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129729929 is a deficient number, since it is larger than the sum of its proper divisors (28324471).

129729929 is a wasteful number, since it uses less digits than its factorization.

129729929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12452.

The product of its digits is 367416, while the sum is 50.

The square root of 129729929 is about 11389.9046967040. The cubic root of 129729929 is about 506.2286574552.

The spelling of 129729929 in words is "one hundred twenty-nine million, seven hundred twenty-nine thousand, nine hundred twenty-nine".