6856657 has 4 divisors (see below), whose sum is σ = 6865776. Its totient is φ = 6847540.

The previous prime is 6856643. The next prime is 6856669. The reversal of 6856657 is 7566586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6856657 - 2⁷ = 6856529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6856697) 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 in 3 ways as a sum of consecutive naturals, for example, 3319 + ... + 4972.

It is an arithmetic number, because the mean of its divisors is an integer number (1716444).

Almost surely, 2^6856657 is an apocalyptic number.

It is an amenable number.

6856657 is a deficient number, since it is larger than the sum of its proper divisors (9119).

6856657 is an equidigital number, since it uses as much as digits as its factorization.

6856657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9118.

The product of its digits is 302400, while the sum is 43.

The square root of 6856657 is about 2618.5219113080. The cubic root of 6856657 is about 189.9783631871.

The spelling of 6856657 in words is "six million, eight hundred fifty-six thousand, six hundred fifty-seven".