6684869 has 2 divisors, whose sum is σ = 6684870. Its totient is φ = 6684868.

The previous prime is 6684833. The next prime is 6684907. The reversal of 6684869 is 9684866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4464769 + 2220100 = 2113^2 + 1490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6684869 is a prime.

It is a super-2 number, since 2×6684869² = 89374947094322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6684569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342434 + 3342435.

It is an arithmetic number, because the mean of its divisors is an integer number (3342435).

Almost surely, 2^6684869 is an apocalyptic number.

It is an amenable number.

6684869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6684869 is an equidigital number, since it uses as much as digits as its factorization.

6684869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 6684869 is about 2585.5113614138. The cubic root of 6684869 is about 188.3783406327.

The spelling of 6684869 in words is "six million, six hundred eighty-four thousand, eight hundred sixty-nine".