6668939 has 2 divisors, whose sum is σ = 6668940. Its totient is φ = 6668938.

The previous prime is 6668911. The next prime is 6668951. The reversal of 6668939 is 9398666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6668939 - 2¹² = 6664843 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6668893 and 6668902.

It is not a weakly prime, because it can be changed into another prime (6668969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334469 + 3334470.

It is an arithmetic number, because the mean of its divisors is an integer number (3334470).

Almost surely, 2^6668939 is an apocalyptic number.

6668939 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668939 is an equidigital number, since it uses as much as digits as its factorization.

6668939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 6668939 is about 2582.4288954393. The cubic root of 6668939 is about 188.2285868225.

The spelling of 6668939 in words is "six million, six hundred sixty-eight thousand, nine hundred thirty-nine".