129944939 has 2 divisors, whose sum is σ = 129944940. Its totient is φ = 129944938.

The previous prime is 129944897. The next prime is 129944951. The reversal of 129944939 is 939449921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129944939 - 2¹⁶ = 129879403 is a prime.

It is not a weakly prime, because it can be changed into another prime (129941939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64972469 + 64972470.

It is an arithmetic number, because the mean of its divisors is an integer number (64972470).

Almost surely, 2^129944939 is an apocalyptic number.

129944939 is a deficient number, since it is larger than the sum of its proper divisors (1).

129944939 is an equidigital number, since it uses as much as digits as its factorization.

129944939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The square root of 129944939 is about 11399.3394106852. The cubic root of 129944939 is about 506.5081718489.

The spelling of 129944939 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, nine hundred thirty-nine".