6855813 has 8 divisors (see below), whose sum is σ = 10156800. Its totient is φ = 4570524.

The previous prime is 6855809. The next prime is 6855829. The reversal of 6855813 is 3185586.

It is not a de Polignac number, because 6855813 - 2² = 6855809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126933 + ... + 126986.

It is an arithmetic number, because the mean of its divisors is an integer number (1269600).

Almost surely, 2^6855813 is an apocalyptic number.

It is an amenable number.

6855813 is a deficient number, since it is larger than the sum of its proper divisors (3300987).

6855813 is a wasteful number, since it uses less digits than its factorization.

6855813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253928 (or 253922 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 6855813 is about 2618.3607467269. The cubic root of 6855813 is about 189.9705679249.

It can be divided in two parts, 685581 and 3, that added together give a square (685584 = 828²).

The spelling of 6855813 in words is "six million, eight hundred fifty-five thousand, eight hundred thirteen".