839

This number is a prime.

Charles III the Fat (Holy Roman Emperor & II King of France) was born in the prime year 839.

(839 - 8)⁸ + (839 - 3)³ + (839 - 9)⁹ is prime. [Opao]

The largest prime factor of 453060, where 453060 is the size of the matrix of E_8. [Pol]

The smallest multidigit prime p such that p*R(p)+1 is emirp, i.e., 839*938+1=786983. [Loungrides]

One hundred factorial minus 839 is prime. [Loungrides]

The smallest number which divided by 2 thru 8 leaves remainders 1 thru 7. [Loungrides]

The number 6*(10^839-1)/9-839 is the only non-titanic prime that consists of n 6’s minus n, for any integer n > 1. Note the form 6*(10^n-1)/9-n. [Loungrides]

(There are 3 curios for this number that have not yet been approved by an editor.)