Hex #405f5d or rgb(64,95,93) in RGB space is the tint of cyan. It has hue angle of 176.13 degrees, value = 37 and saturation = 33. #405f5d can be obtained by mixing 4 colors: 3 drops of red, 5 drops of blue, 1 drop of cyan, 3 drops of green.
Nearest safe hex - #336666. Below you can see the block with #405f5d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #405f5d to the mixer and play with it.