Hex #40b4bf or rgb(64,180,191) in RGB space is the tint of cyan. It has hue angle of 185.20 degrees, value = 75 and saturation = 66. #40b4bf can be obtained by mixing 4 colors: 1 drop of red, 5 drops of cyan, 1 drop of white, 1 drop of black.
Nearest safe hex - #33cccc. Below you can see the block with #40b4bf color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40b4bf to the mixer and play with it.