Hex #40b38a or rgb(64,179,138) in RGB space is the tint of greenish cian. It has hue angle of 158.61 degrees, value = 70 and saturation = 64. #40b38a can be obtained by mixing 4 colors: 2 drops of blue, 1 drop of cyan, 3 drops of green, 2 drops of white.
Nearest safe hex - #33cc99. Below you can see the block with #40b38a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40b38a to the mixer and play with it.