840795779 has 2 divisors, whose sum is σ = 840795780. Its totient is φ = 840795778.

The previous prime is 840795773. The next prime is 840795799. The reversal of 840795779 is 977597048.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840795779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840795773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420397889 + 420397890.

It is an arithmetic number, because the mean of its divisors is an integer number (420397890).

Almost surely, 2^840795779 is an apocalyptic number.

840795779 is a deficient number, since it is larger than the sum of its proper divisors (1).

840795779 is an equidigital number, since it uses as much as digits as its factorization.

840795779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The square root of 840795779 is about 28996.4787344946. The cubic root of 840795779 is about 943.8366577210.

The spelling of 840795779 in words is "eight hundred forty million, seven hundred ninety-five thousand, seven hundred seventy-nine".