Hex #40b087 or rgb(64,176,135) in RGB space is the tint of greenish cian. It has hue angle of 158.04 degrees, value = 69 and saturation = 64. #40b087 can be obtained by mixing 4 colors: 2 drops of magenta, 4 drops of cyan, 5 drops of green, 1 drop of white.
Nearest safe hex - #339999. Below you can see the block with #40b087 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40b087 to the mixer and play with it.