6977639 has 2 divisors, whose sum is σ = 6977640. Its totient is φ = 6977638.

The previous prime is 6977623. The next prime is 6977681. The reversal of 6977639 is 9367796.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6977639 - 2⁴ = 6977623 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6977593 and 6977602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6977699) 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, 3488819 + 3488820.

It is an arithmetic number, because the mean of its divisors is an integer number (3488820).

Almost surely, 2^6977639 is an apocalyptic number.

6977639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6977639 is an equidigital number, since it uses as much as digits as its factorization.

6977639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 428652, while the sum is 47.

The square root of 6977639 is about 2641.5220990936. The cubic root of 6977639 is about 191.0892102655.

The spelling of 6977639 in words is "six million, nine hundred seventy-seven thousand, six hundred thirty-nine".