129729239 has 2 divisors, whose sum is σ = 129729240. Its totient is φ = 129729238.

The previous prime is 129729217. The next prime is 129729241. The reversal of 129729239 is 932927921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129729239 - 2⁸ = 129728983 is a prime.

Together with 129729241, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129729239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129729539) 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 as a sum of consecutive naturals, namely, 64864619 + 64864620.

It is an arithmetic number, because the mean of its divisors is an integer number (64864620).

Almost surely, 2^129729239 is an apocalyptic number.

129729239 is a deficient number, since it is larger than the sum of its proper divisors (1).

129729239 is an equidigital number, since it uses as much as digits as its factorization.

129729239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 129729239 is about 11389.8744066825. The cubic root of 129729239 is about 506.2277599537.

The spelling of 129729239 in words is "one hundred twenty-nine million, seven hundred twenty-nine thousand, two hundred thirty-nine".