129442393 has 2 divisors, whose sum is σ = 129442394. Its totient is φ = 129442392.

The previous prime is 129442387. The next prime is 129442433. The reversal of 129442393 is 393244921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69022864 + 60419529 = 8308^2 + 7773^2 .

It is a cyclic number.

It is not a de Polignac number, because 129442393 - 2⁵ = 129442361 is a prime.

It is not a weakly prime, because it can be changed into another prime (129442303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64721196 + 64721197.

It is an arithmetic number, because the mean of its divisors is an integer number (64721197).

Almost surely, 2^129442393 is an apocalyptic number.

It is an amenable number.

129442393 is a deficient number, since it is larger than the sum of its proper divisors (1).

129442393 is an equidigital number, since it uses as much as digits as its factorization.

129442393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 129442393 is about 11377.2752889257. The cubic root of 129442393 is about 505.8543757020.

The spelling of 129442393 in words is "one hundred twenty-nine million, four hundred forty-two thousand, three hundred ninety-three".