839847117947 has 2 divisors, whose sum is σ = 839847117948. Its totient is φ = 839847117946.

The previous prime is 839847117943. The next prime is 839847117953. The reversal of 839847117947 is 749711748938.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 839847117947 - 2² = 839847117943 is a prime.

It is not a weakly prime, because it can be changed into another prime (839847117943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419923558973 + 419923558974.

It is an arithmetic number, because the mean of its divisors is an integer number (419923558974).

Almost surely, 2^839847117947 is an apocalyptic number.

839847117947 is a deficient number, since it is larger than the sum of its proper divisors (1).

839847117947 is an equidigital number, since it uses as much as digits as its factorization.

839847117947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85349376, while the sum is 68.

The spelling of 839847117947 in words is "eight hundred thirty-nine billion, eight hundred forty-seven million, one hundred seventeen thousand, nine hundred forty-seven".