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1 gross = 144 units.
In a number (integer) the last digit on the right is "how many units". Then next to the left is "how many tens". The next is "how many hundreds". Notice the progression 1 to 10 to 100. To the right of the decimal point, for numbers smaller than 1, in sequence you have 1/10, 1/100, 1/100 etc. 52 means 5 tens and 2 units. 25 means 2 tens and 5 units.
The answer will depend on the two units. It will entail multiplication by a number that is greater than 1 (or division by a number smaller than 1).
Wavenumber is inversely proportional to wavelength, so has units m^-1