Hex #40a440 or rgb(64,164,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 64 and saturation = 61. #40a440 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of cyan, 1 drop of green, 1 drop of black.
Nearest safe hex - #339933. Below you can see the block with #40a440 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a440 to the mixer and play with it.