16,843

Number
$16 \, 843$ (sixteen thousand, eight hundred and forty-three) is:


 * The $1944$th prime number


 * The smallest counterexample to Charles Babbage's Conjecture $p^2 \mathrel \backslash \dbinom {2 p - 1} {p - 1} - 1$ $p$ is prime

Also see

 * Charles Babbage's Conjecture