Docs / Date & time
FormatNumber is an AMPscript function in the date & time category. N/C/P/F patterns and #,##0.00-style masks; en-US output.
FormatNumber(number, pattern, [culture])
%%=FormatNumber(1234.5, "C2")=%%
$1,234.50
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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FormatNumber in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.