Hex #40a3aa or rgb(64,163,170) in RGB space is the tint of cyan. It has hue angle of 183.96 degrees, value = 67 and saturation = 62. #40a3aa can be obtained by mixing 3 colors: 5 drops of cyan, 3 drops of white, 4 drops of black.
Nearest safe hex - #339999. Below you can see the block with #40a3aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40a3aa to the mixer and play with it.