f(numerator/1)

Documentation
- Reference manual
  - Built-in Predicates
    - Arithmetic
      - General purpose arithmetic
        
        Arithmetic Functions
        
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        rationalize/1
        
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- Packages

Availability:Arithmetic function (see is/2)

numerator(+RationalExpr)

If RationalExpr evaluates to a rational number or integer, evaluate to the top/left value. Evaluates to itself if RationalExpr evaluates to an integer. See also denominator/1. The following is true for any rational X.

X =:= numerator(X)/denominator(X).