Hex #40ca20 or rgb(64,202,32) in RGB space is the tint of grass green. It has hue angle of 108.71 degrees, value = 79 and saturation = 84. #40ca20 can be obtained by mixing 3 colors: 2 drops of yellow, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #33cc33. Below you can see the block with #40ca20 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40ca20 to the mixer and play with it.