6856557 has 16 divisors (see below), whose sum is σ = 9642240. Its totient is φ = 4327232.

The previous prime is 6856543. The next prime is 6856561. The reversal of 6856557 is 7556586.

It is a cyclic number.

It is not a de Polignac number, because 6856557 - 2⁷ = 6856429 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3868 + ... + 5354.

It is an arithmetic number, because the mean of its divisors is an integer number (602640).

Almost surely, 2^6856557 is an apocalyptic number.

It is an amenable number.

6856557 is a deficient number, since it is larger than the sum of its proper divisors (2785683).

6856557 is a wasteful number, since it uses less digits than its factorization.

6856557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its digits is 252000, while the sum is 42.

The square root of 6856557 is about 2618.5028164965. The cubic root of 6856557 is about 189.9774396112.

The spelling of 6856557 in words is "six million, eight hundred fifty-six thousand, five hundred fifty-seven".