129636839 has 2 divisors, whose sum is σ = 129636840. Its totient is φ = 129636838.

The previous prime is 129636827. The next prime is 129636847. The reversal of 129636839 is 938636921.

It is a strong prime.

It is an emirp because it is prime and its reverse (938636921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129636839 - 2¹⁶ = 129571303 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129636793 and 129636802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129636889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64818419 + 64818420.

It is an arithmetic number, because the mean of its divisors is an integer number (64818420).

Almost surely, 2^129636839 is an apocalyptic number.

129636839 is a deficient number, since it is larger than the sum of its proper divisors (1).

129636839 is an equidigital number, since it uses as much as digits as its factorization.

129636839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 129636839 is about 11385.8174497925. The cubic root of 129636839 is about 506.1075440459.

The spelling of 129636839 in words is "one hundred twenty-nine million, six hundred thirty-six thousand, eight hundred thirty-nine".