6865643 has 2 divisors, whose sum is σ = 6865644. Its totient is φ = 6865642.

The previous prime is 6865613. The next prime is 6865657. The reversal of 6865643 is 3465686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6865643 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 6865597 and 6865606.

It is not a weakly prime, because it can be changed into another prime (6865613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3432821 + 3432822.

It is an arithmetic number, because the mean of its divisors is an integer number (3432822).

Almost surely, 2^6865643 is an apocalyptic number.

6865643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6865643 is an equidigital number, since it uses as much as digits as its factorization.

6865643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 38.

The square root of 6865643 is about 2620.2372030028. The cubic root of 6865643 is about 190.0613190817.

The spelling of 6865643 in words is "six million, eight hundred sixty-five thousand, six hundred forty-three".