Hex #3997b4 or rgb(57,151,180) in RGB space is the tint of bluish cian. It has hue angle of 194.15 degrees, value = 71 and saturation = 68. #3997b4 can be obtained by mixing 4 colors: 2 drops of blue, 3 drops of cyan, 2 drops of white, 2 drops of black.
Nearest safe hex - #3399cc. Below you can see the block with #3997b4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #3997b4 to the mixer and play with it.