Reading P value from ANOVA table generated by R

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I generated an ANOVA table in R and every boxes are in number except the P value shows "3.387e-05". What does that really mean?

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3.387e-05 is computer scientific notation for $3.387 \times 10^{-5}$, or $.00003387$. The "e" in this case means "exponent," and the exponent in this case is -5, while the base is ten.