1050

Number
$1050$ (one thousand and fifty) is:


 * $2 \times 3 \times 5^2 \times 7$


 * With $1925$, an element of the $3$rd quasiamicable pair:
 * $\map {\sigma_1} {1050} = \map {\sigma_1} {1925} = 2976 = 1050 + 1925 + 1$