title: How to calculate the inverse factorial of a real number?
body: <p>Is there some way to calculate the inverse factorials of real numbers?</p>
  
  <p>For example - <a href="http://www.google.co.in/search?q=1.5!" rel="noreferrer"><code>1.5 ! = 1.32934039</code></a></p>
  
  <p>Is there some way to obtain <code>1.5</code> back if I have the value <code>1.32934039</code>?</p>
  
  <p>I am trying</p>
  
  <blockquote>
    <p><code>http://www.wolframalpha.com/input/?i=Gamma^(-1)[1.32934039]</code></p>
  </blockquote>
  
  <p>but that is a fail.</p>