Hex #40ac40 or rgb(64,172,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 67 and saturation = 63. #40ac40 can be obtained by mixing 4 colors: 3 drops of yellow, 3 drops of blue, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #339933. Below you can see the block with #40ac40 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40ac40 to the mixer and play with it.