129306839 has 2 divisors, whose sum is σ = 129306840. Its totient is φ = 129306838.

The previous prime is 129306787. The next prime is 129306857. The reversal of 129306839 is 938603921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129306839 is a prime.

It is a super-2 number, since 2×129306839² = 33440517224343842, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129306796 and 129306805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129306899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64653419 + 64653420.

It is an arithmetic number, because the mean of its divisors is an integer number (64653420).

Almost surely, 2^129306839 is an apocalyptic number.

129306839 is a deficient number, since it is larger than the sum of its proper divisors (1).

129306839 is an equidigital number, since it uses as much as digits as its factorization.

129306839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 129306839 is about 11371.3165024987. The cubic root of 129306839 is about 505.6777346175.

The spelling of 129306839 in words is "one hundred twenty-nine million, three hundred six thousand, eight hundred thirty-nine".