6856643 has 2 divisors, whose sum is σ = 6856644. Its totient is φ = 6856642.

The previous prime is 6856631. The next prime is 6856669. The reversal of 6856643 is 3466586.

6856643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6856643 - 2⁸ = 6856387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6856597 and 6856606.

It is not a weakly prime, because it can be changed into another prime (6856613) 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, 3428321 + 3428322.

It is an arithmetic number, because the mean of its divisors is an integer number (3428322).

Almost surely, 2^6856643 is an apocalyptic number.

6856643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856643 is an equidigital number, since it uses as much as digits as its factorization.

6856643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The square root of 6856643 is about 2618.5192380428. The cubic root of 6856643 is about 189.9782338870.

The spelling of 6856643 in words is "six million, eight hundred fifty-six thousand, six hundred forty-three".