6679639 has 2 divisors, whose sum is σ = 6679640. Its totient is φ = 6679638.

The previous prime is 6679619. The next prime is 6679661. The reversal of 6679639 is 9369766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6679639 - 2¹³ = 6671447 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6679619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339819 + 3339820.

It is an arithmetic number, because the mean of its divisors is an integer number (3339820).

Almost surely, 2^6679639 is an apocalyptic number.

6679639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6679639 is an equidigital number, since it uses as much as digits as its factorization.

6679639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 46.

The square root of 6679639 is about 2584.4997581737. The cubic root of 6679639 is about 188.3292010127.

The spelling of 6679639 in words is "six million, six hundred seventy-nine thousand, six hundred thirty-nine".