Hex #3981d0 or rgb(57,129,208) in RGB space is the tint of blue. It has hue angle of 211.39 degrees, value = 82 and saturation = 73. #3981d0 can be obtained by mixing 3 colors: 2 drops of magenta, 3 drops of blue, 4 drops of cyan.
Nearest safe hex - #3399cc. Below you can see the block with #3981d0 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #3981d0 to the mixer and play with it.