6866789 has 2 divisors, whose sum is σ = 6866790. Its totient is φ = 6866788.

The previous prime is 6866777. The next prime is 6866791. The reversal of 6866789 is 9876686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5678689 + 1188100 = 2383^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 6866789 - 2⁴ = 6866773 is a prime.

Together with 6866791, 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 (6866729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3433394 + 3433395.

It is an arithmetic number, because the mean of its divisors is an integer number (3433395).

Almost surely, 2^6866789 is an apocalyptic number.

It is an amenable number.

6866789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6866789 is an equidigital number, since it uses as much as digits as its factorization.

6866789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 6866789 is about 2620.4558763696. The cubic root of 6866789 is about 190.0718933841.

The spelling of 6866789 in words is "six million, eight hundred sixty-six thousand, seven hundred eighty-nine".