6866647 has 2 divisors, whose sum is σ = 6866648. Its totient is φ = 6866646.

The previous prime is 6866633. The next prime is 6866659. The reversal of 6866647 is 7466686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6866647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6866677) 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, 3433323 + 3433324.

It is an arithmetic number, because the mean of its divisors is an integer number (3433324).

Almost surely, 2^6866647 is an apocalyptic number.

6866647 is a deficient number, since it is larger than the sum of its proper divisors (1).

6866647 is an equidigital number, since it uses as much as digits as its factorization.

6866647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 43.

The square root of 6866647 is about 2620.4287817073. The cubic root of 6866647 is about 190.0705831940.

The spelling of 6866647 in words is "six million, eight hundred sixty-six thousand, six hundred forty-seven".