Hex #40a88e or rgb(64,168,142) in RGB space is the tint of greenish cian. It has hue angle of 165.00 degrees, value = 66 and saturation = 62. #40a88e can be obtained by mixing 4 colors: 4 drops of blue, 1 drop of cyan, 4 drops of green, 3 drops of white.
Nearest safe hex - #339999. Below you can see the block with #40a88e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a88e to the mixer and play with it.