Hex #129f86 or rgb(18,159,134) in RGB space is the tint of greenish cian. It has hue angle of 169.36 degrees, value = 62 and saturation = 89. #129f86 can be obtained by mixing 4 colors: 5 drops of blue, 3 drops of cyan, 5 drops of green, 1 drop of white.
Nearest safe hex - #009999. Below you can see the block with #129f86 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #129f86 to the mixer and play with it.