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I assume you mean 4 X 10^-17 Joules.

Energy = Planck's constant * speed of light/wavelength in meters

4 X 10^-17 Joules = (6.626 X 10^-34 J*s)(2.998 X 10^8 m/s)/wavelength

wavelength in meters = (6.626 X 10^-34)(2.998 X 10^8)/(4 X 10^-17)

= 4.9662 X 10^-9 meters

or

4.97 nanometers

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