Hex #40b18e or rgb(64,177,142) in RGB space is the tint of greenish cian. It has hue angle of 161.42 degrees, value = 69 and saturation = 64. #40b18e can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of blue, 4 drops of cyan, 1 drop of green.
Nearest safe hex - #339999. Below you can see the block with #40b18e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40b18e to the mixer and play with it.