Hex #40d140 or rgb(64,209,64) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 82 and saturation = 69. #40d140 can be obtained by mixing 3 colors: 1 drop of yellow, 1 drop of cyan, 2 drops of green.
Nearest safe hex - #33cc33. Below you can see the block with #40d140 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40d140 to the mixer and play with it.