Hex #40a68a or rgb(64,166,138) in RGB space is the tint of greenish cian. It has hue angle of 163.53 degrees, value = 65 and saturation = 61. #40a68a can be obtained by mixing 4 colors: 2 drops of yellow, 2 drops of blue, 3 drops of cyan, 1 drop of black.
Nearest safe hex - #339999. Below you can see the block with #40a68a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a68a to the mixer and play with it.