6406679 has 2 divisors, whose sum is σ = 6406680. Its totient is φ = 6406678.

The previous prime is 6406657. The next prime is 6406681. The reversal of 6406679 is 9766046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6406679 is a prime.

Together with 6406681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6406639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3203339 + 3203340.

It is an arithmetic number, because the mean of its divisors is an integer number (3203340).

Almost surely, 2^6406679 is an apocalyptic number.

6406679 is a deficient number, since it is larger than the sum of its proper divisors (1).

6406679 is an equidigital number, since it uses as much as digits as its factorization.

6406679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 6406679 is about 2531.1418371952. The cubic root of 6406679 is about 185.7281166650.

The spelling of 6406679 in words is "six million, four hundred six thousand, six hundred seventy-nine".