Hex #40a030 or rgb(64,160,48) in RGB space is the tint of grass green. It has hue angle of 111.43 degrees, value = 63 and saturation = 70. #40a030 can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of cyan, 5 drops of green, 4 drops of black.
Nearest safe hex - #339933. Below you can see the block with #40a030 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a030 to the mixer and play with it.