Hex #40a387 or rgb(64,163,135) in RGB space is the tint of greenish cian. It has hue angle of 163.03 degrees, value = 64 and saturation = 61. #40a387 can be obtained by mixing 4 colors: 3 drops of yellow, 5 drops of blue, 3 drops of cyan, 1 drop of green.
Nearest safe hex - #339999. Below you can see the block with #40a387 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a387 to the mixer and play with it.