6644843 has 2 divisors, whose sum is σ = 6644844. Its totient is φ = 6644842.

The previous prime is 6644837. The next prime is 6644863. The reversal of 6644843 is 3484466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6644843 - 2⁸ = 6644587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6644863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322421 + 3322422.

It is an arithmetic number, because the mean of its divisors is an integer number (3322422).

Almost surely, 2^6644843 is an apocalyptic number.

6644843 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644843 is an equidigital number, since it uses as much as digits as its factorization.

6644843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 35.

The square root of 6644843 is about 2577.7592983054. The cubic root of 6644843 is about 188.0016127069.

The spelling of 6644843 in words is "six million, six hundred forty-four thousand, eight hundred forty-three".