Hex #408b39 or rgb(64,139,57) in RGB space is the tint of green. It has hue angle of 114.88 degrees, value = 55 and saturation = 59. #408b39 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of red, 4 drops of blue, 5 drops of green.
Nearest safe hex - #339933. Below you can see the block with #408b39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #408b39 to the mixer and play with it.