858

Number
$858$ (eight hundred and fifty-eight) is:


 * $2 \times 3 \times 11 \times 13$


 * The $2$nd Giuga number:
 * $\dfrac 1 2 + \dfrac 1 3 + \dfrac 1 {11} + \dfrac 1 {13} - \dfrac 1 {858} = 1$