How do you get excel to recognize the data as a number when using the right
or left formula? For example, cell L73 has the following formula:

=RIGHT(D3,5)
The data this equation produces is +137. I have another cell that has a
formula that says =IF(ISNUMBER(L73),L73,"NO"). The answer I get is NO. I
should get +173. I have formatted cell L73 to be a number.

How do I fix this formula? Thanks