129995399 has 2 divisors, whose sum is σ = 129995400. Its totient is φ = 129995398.

The previous prime is 129995387. The next prime is 129995443. The reversal of 129995399 is 993599921.

It is a weak prime.

It is an emirp because it is prime and its reverse (993599921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129995399 - 2²⁰ = 128946823 is a prime.

It is a super-2 number, since 2×129995399² = 33797607522338402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129995329) 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, 64997699 + 64997700.

It is an arithmetic number, because the mean of its divisors is an integer number (64997700).

Almost surely, 2^129995399 is an apocalyptic number.

129995399 is a deficient number, since it is larger than the sum of its proper divisors (1).

129995399 is an equidigital number, since it uses as much as digits as its factorization.

129995399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1771470, while the sum is 56.

The square root of 129995399 is about 11401.5524820088. The cubic root of 129995399 is about 506.5737254980.

The spelling of 129995399 in words is "one hundred twenty-nine million, nine hundred ninety-five thousand, three hundred ninety-nine".