129329329 has 4 divisors (see below), whose sum is σ = 129702384. Its totient is φ = 128956276.

The previous prime is 129329311. The next prime is 129329419. The reversal of 129329329 is 923923921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 923923921 = 107 ⋅8634803.

It is a cyclic number.

It is not a de Polignac number, because 129329329 - 2⁵ = 129329297 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129329291 and 129329300.

It is not an unprimeable number, because it can be changed into a prime (129329429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186007 + ... + 186700.

It is an arithmetic number, because the mean of its divisors is an integer number (32425596).

Almost surely, 2^129329329 is an apocalyptic number.

It is an amenable number.

129329329 is a deficient number, since it is larger than the sum of its proper divisors (373055).

129329329 is an equidigital number, since it uses as much as digits as its factorization.

129329329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373054.

The product of its digits is 52488, while the sum is 40.

The square root of 129329329 is about 11372.3053511590. The cubic root of 129329329 is about 505.7070499862.

The spelling of 129329329 in words is "one hundred twenty-nine million, three hundred twenty-nine thousand, three hundred twenty-nine".