856308679 has 2 divisors, whose sum is σ = 856308680. Its totient is φ = 856308678.

The previous prime is 856308671. The next prime is 856308707. The reversal of 856308679 is 976803658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856308679 - 2³ = 856308671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856308671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428154339 + 428154340.

It is an arithmetic number, because the mean of its divisors is an integer number (428154340).

Almost surely, 2^856308679 is an apocalyptic number.

856308679 is a deficient number, since it is larger than the sum of its proper divisors (1).

856308679 is an equidigital number, since it uses as much as digits as its factorization.

856308679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 856308679 is about 29262.7524166815. The cubic root of 856308679 is about 949.6059969092.

The spelling of 856308679 in words is "eight hundred fifty-six million, three hundred eight thousand, six hundred seventy-nine".