6684449 has 2 divisors, whose sum is σ = 6684450. Its totient is φ = 6684448.

The previous prime is 6684443. The next prime is 6684473. The reversal of 6684449 is 9444866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6630625 + 53824 = 2575^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 6684449 - 2⁸ = 6684193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6684443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342224 + 3342225.

It is an arithmetic number, because the mean of its divisors is an integer number (3342225).

Almost surely, 2^6684449 is an apocalyptic number.

It is an amenable number.

6684449 is a deficient number, since it is larger than the sum of its proper divisors (1).

6684449 is an equidigital number, since it uses as much as digits as its factorization.

6684449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 41.

The square root of 6684449 is about 2585.4301382942. The cubic root of 6684449 is about 188.3743953766.

The spelling of 6684449 in words is "six million, six hundred eighty-four thousand, four hundred forty-nine".