Hex #004840 or rgb(0,72,64) in RGB space is the tint of cyan. It has hue angle of 173.33 degrees, value = 28 and saturation = 100. #004840 can be obtained by mixing 3 colors: 3 drops of blue, 2 drops of green, 3 drops of black.
Nearest safe hex - #003333. Below you can see the block with #004840 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #004840 to the mixer and play with it.