129994399 has 2 divisors, whose sum is σ = 129994400. Its totient is φ = 129994398.

The previous prime is 129994349. The next prime is 129994411. The reversal of 129994399 is 993499921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129994399 - 2¹⁵ = 129961631 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129994349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64997199 + 64997200.

It is an arithmetic number, because the mean of its divisors is an integer number (64997200).

Almost surely, 2^129994399 is an apocalyptic number.

129994399 is a deficient number, since it is larger than the sum of its proper divisors (1).

129994399 is an equidigital number, since it uses as much as digits as its factorization.

129994399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1417176, while the sum is 55.

The square root of 129994399 is about 11401.5086282474. The cubic root of 129994399 is about 506.5724265417.

The spelling of 129994399 in words is "one hundred twenty-nine million, nine hundred ninety-four thousand, three hundred ninety-nine".