813386939 has 2 divisors, whose sum is σ = 813386940. Its totient is φ = 813386938.

The previous prime is 813386911. The next prime is 813387023. The reversal of 813386939 is 939683318.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813386939 is a prime.

It is not a weakly prime, because it can be changed into another prime (813386909) 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, 406693469 + 406693470.

It is an arithmetic number, because the mean of its divisors is an integer number (406693470).

Almost surely, 2^813386939 is an apocalyptic number.

813386939 is a deficient number, since it is larger than the sum of its proper divisors (1).

813386939 is an equidigital number, since it uses as much as digits as its factorization.

813386939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 813386939 is about 28519.9393232174. The cubic root of 813386939 is about 933.4672051879.

The spelling of 813386939 in words is "eight hundred thirteen million, three hundred eighty-six thousand, nine hundred thirty-nine".