Hex #408b80 or rgb(64,139,128) in RGB space is the tint of greenish cian. It has hue angle of 171.20 degrees, value = 55 and saturation = 54. #408b80 can be obtained by mixing 4 colors: 3 drops of magenta, 4 drops of cyan, 4 drops of green, 1 drop of black.
Nearest safe hex - #339999. Below you can see the block with #408b80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #408b80 to the mixer and play with it.