Hex #15a88e or rgb(21,168,142) in RGB space is the tint of greenish cian. It has hue angle of 169.39 degrees, value = 66 and saturation = 88. #15a88e can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 4 drops of cyan, 3 drops of green.
Nearest safe hex - #009999. Below you can see the block with #15a88e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15a88e to the mixer and play with it.