129807329 has 8 divisors (see below), whose sum is σ = 132516072. Its totient is φ = 127117440.

The previous prime is 129807317. The next prime is 129807343. The reversal of 129807329 is 923708921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1098304 + 128709025 = 1048^2 + 11345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129807329 - 2⁴ = 129807313 is a prime.

It is a super-2 number, since 2×129807329² = 33699885324228482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129806329) 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 7 ways as a sum of consecutive naturals, for example, 9647 + ... + 18779.

It is an arithmetic number, because the mean of its divisors is an integer number (16564509).

Almost surely, 2^129807329 is an apocalyptic number.

It is an amenable number.

129807329 is a deficient number, since it is larger than the sum of its proper divisors (2708743).

129807329 is an equidigital number, since it uses as much as digits as its factorization.

129807329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 129807329 is about 11393.3019357867. The cubic root of 129807329 is about 506.3293135095.

The spelling of 129807329 in words is "one hundred twenty-nine million, eight hundred seven thousand, three hundred twenty-nine".