Hex #408f39 or rgb(64,143,57) in RGB space is the tint of green. It has hue angle of 115.12 degrees, value = 56 and saturation = 60. #408f39 can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of blue, 4 drops of green, 1 drop of black.
Nearest safe hex - #339933. Below you can see the block with #408f39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #408f39 to the mixer and play with it.