Hex #40a4aa or rgb(64,164,170) in RGB space is the tint of cyan. It has hue angle of 183.40 degrees, value = 67 and saturation = 62. #40a4aa can be obtained by mixing 3 colors: 1 drop of magenta, 2 drops of cyan, 1 drop of green.
Nearest safe hex - #339999. Below you can see the block with #40a4aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a4aa to the mixer and play with it.