6813857 has 2 divisors, whose sum is σ = 6813858. Its totient is φ = 6813856.

The previous prime is 6813853. The next prime is 6813881. The reversal of 6813857 is 7583186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4596736 + 2217121 = 2144^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 6813857 - 2² = 6813853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6813857.

It is not a weakly prime, because it can be changed into another prime (6813853) 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, 3406928 + 3406929.

It is an arithmetic number, because the mean of its divisors is an integer number (3406929).

Almost surely, 2^6813857 is an apocalyptic number.

It is an amenable number.

6813857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6813857 is an equidigital number, since it uses as much as digits as its factorization.

6813857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 6813857 is about 2610.3365683375. The cubic root of 6813857 is about 189.5822492981.

The spelling of 6813857 in words is "six million, eight hundred thirteen thousand, eight hundred fifty-seven".