129823739 has 2 divisors, whose sum is σ = 129823740. Its totient is φ = 129823738.

The previous prime is 129823723. The next prime is 129823831. The reversal of 129823739 is 937328921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129823739 - 2⁴ = 129823723 is a prime.

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 129823739.

It is not a weakly prime, because it can be changed into another prime (129823139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64911869 + 64911870.

It is an arithmetic number, because the mean of its divisors is an integer number (64911870).

Almost surely, 2^129823739 is an apocalyptic number.

129823739 is a deficient number, since it is larger than the sum of its proper divisors (1).

129823739 is an equidigital number, since it uses as much as digits as its factorization.

129823739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 129823739 is about 11394.0220729995. The cubic root of 129823739 is about 506.3506490124.

The spelling of 129823739 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, seven hundred thirty-nine".