Hex #3999aa or rgb(57,153,170) in RGB space is the tint of bluish cian. It has hue angle of 189.03 degrees, value = 67 and saturation = 66. #3999aa can be obtained by mixing 4 colors: 2 drops of magenta, 1 drop of blue, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #339999. Below you can see the block with #3999aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #3999aa to the mixer and play with it.