The cube root of 40, denoted as \( \sqrt[3]{40} \), is an irrational number. To approximate it, we can use a calculator or perform a numerical method.
Calculating it gives approximately:
\[ \sqrt[3]{40} \approx 3.419 \]
This means that the exact value of \( \sqrt[3]{40} \) cannot be expressed as a simple fraction, and its decimal representation is non-repeating and non-terminating.