129949399 has 2 divisors, whose sum is σ = 129949400. Its totient is φ = 129949398.

The previous prime is 129949387. The next prime is 129949403. The reversal of 129949399 is 993949921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129949399 - 2⁵ = 129949367 is a prime.

It is a super-2 number, since 2×129949399² = 33773692600922402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129949499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64974699 + 64974700.

It is an arithmetic number, because the mean of its divisors is an integer number (64974700).

Almost surely, 2^129949399 is an apocalyptic number.

129949399 is a deficient number, since it is larger than the sum of its proper divisors (1).

129949399 is an equidigital number, since it uses as much as digits as its factorization.

129949399 is an odious number, because the sum of its binary digits is odd.

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

The square root of 129949399 is about 11399.5350343775. The cubic root of 129949399 is about 506.5139666125.

The spelling of 129949399 in words is "one hundred twenty-nine million, nine hundred forty-nine thousand, three hundred ninety-nine".