6856645 has 16 divisors (see below), whose sum is σ = 8680320. Its totient is φ = 5189184.

The previous prime is 6856643. The next prime is 6856669. The reversal of 6856645 is 5466586.

It is a cyclic number.

It is not a de Polignac number, because 6856645 - 2¹ = 6856643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6856598 and 6856607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856643) 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 15 ways as a sum of consecutive naturals, for example, 12262 + ... + 12808.

It is an arithmetic number, because the mean of its divisors is an integer number (542520).

Almost surely, 2^6856645 is an apocalyptic number.

It is an amenable number.

6856645 is a deficient number, since it is larger than the sum of its proper divisors (1823675).

6856645 is a wasteful number, since it uses less digits than its factorization.

6856645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 172800, while the sum is 40.

The square root of 6856645 is about 2618.5196199380. The cubic root of 6856645 is about 189.9782523585.

The spelling of 6856645 in words is "six million, eight hundred fifty-six thousand, six hundred forty-five".