129380399 has 2 divisors, whose sum is σ = 129380400. Its totient is φ = 129380398.

The previous prime is 129380371. The next prime is 129380401. The reversal of 129380399 is 993083921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129380399 is a prime.

Together with 129380401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129280399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64690199 + 64690200.

It is an arithmetic number, because the mean of its divisors is an integer number (64690200).

Almost surely, 2^129380399 is an apocalyptic number.

129380399 is a deficient number, since it is larger than the sum of its proper divisors (1).

129380399 is an equidigital number, since it uses as much as digits as its factorization.

129380399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 129380399 is about 11374.5504966130. The cubic root of 129380399 is about 505.7736063260.

The spelling of 129380399 in words is "one hundred twenty-nine million, three hundred eighty thousand, three hundred ninety-nine".