Hex #407f6b or rgb(64,127,107) in RGB space is the tint of greenish cian. It has hue angle of 160.95 degrees, value = 50 and saturation = 50. #407f6b can be obtained by mixing 4 colors: 1 drop of blue, 1 drop of green, 1 drop of white, 1 drop of black.
Nearest safe hex - #336666. Below you can see the block with #407f6b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #407f6b to the mixer and play with it.