129439393 has 2 divisors, whose sum is σ = 129439394. Its totient is φ = 129439392.

The previous prime is 129439339. The next prime is 129439399. The reversal of 129439393 is 393934921.

It is a happy number.

Together with previous prime (129439339) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84052224 + 45387169 = 9168^2 + 6737^2 .

It is an emirp because it is prime and its reverse (393934921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129439393 - 2¹³ = 129431201 is a prime.

It is not a weakly prime, because it can be changed into another prime (129439399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64719696 + 64719697.

It is an arithmetic number, because the mean of its divisors is an integer number (64719697).

Almost surely, 2^129439393 is an apocalyptic number.

It is an amenable number.

129439393 is a deficient number, since it is larger than the sum of its proper divisors (1).

129439393 is an equidigital number, since it uses as much as digits as its factorization.

129439393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 43.

The square root of 129439393 is about 11377.1434464016. The cubic root of 129439393 is about 505.8504677220.

The spelling of 129439393 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, three hundred ninety-three".