the short answer is "yes, it's possible" - you can concatenate numbers and strings, or you can include strings in your numeric format.
As a side comment, it appears to me that your formula might be unnecessarily complex. I have a feeling that there should be a simpler way of achieving the same, but it's hard for me to assess, without seeing it in the context of your application.
Cheers,
Oleg Troyansky
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