6686947 has 2 divisors, whose sum is σ = 6686948. Its totient is φ = 6686946.

The previous prime is 6686941. The next prime is 6686983. The reversal of 6686947 is 7496866.

6686947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6686947 - 2¹⁹ = 6162659 is a prime.

It is a Chen prime.

It is an Ulam number.

6686947 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6686897 and 6686906.

It is not a weakly prime, because it can be changed into another prime (6686941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343473 + 3343474.

It is an arithmetic number, because the mean of its divisors is an integer number (3343474).

Almost surely, 2^6686947 is an apocalyptic number.

6686947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686947 is an equidigital number, since it uses as much as digits as its factorization.

6686947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 6686947 is about 2585.9131849310. The cubic root of 6686947 is about 188.3978578258.

The spelling of 6686947 in words is "six million, six hundred eighty-six thousand, nine hundred forty-seven".