Hex #409980 or rgb(64,153,128) in RGB space is the tint of greenish cian. It has hue angle of 163.15 degrees, value = 60 and saturation = 58. #409980 can be obtained by mixing 4 colors: 3 drops of cyan, 2 drops of green, 3 drops of white, 4 drops of black.
Nearest safe hex - #339999. Below you can see the block with #409980 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #409980 to the mixer and play with it.