844643 has 2 divisors, whose sum is σ = 844644. Its totient is φ = 844642.

The previous prime is 844639. The next prime is 844651. The reversal of 844643 is 346448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 844643 - 2² = 844639 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (844603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422321 + 422322.

It is an arithmetic number, because the mean of its divisors is an integer number (422322).

2⁸⁴⁴⁶⁴³ is an apocalyptic number.

844643 is a deficient number, since it is larger than the sum of its proper divisors (1).

844643 is an equidigital number, since it uses as much as digits as its factorization.

844643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

The square root of 844643 is about 919.0446126277. The cubic root of 844643 is about 94.5274035659.

The spelling of 844643 in words is "eight hundred forty-four thousand, six hundred forty-three".