4784009

This number is a prime.

The largest possible prime value resulting from the ninedigital fraction equation (A/B)^C + (D/E)^F + (G/H)^I, where the letters A to I represent any combination of the nine digits 1 through 9. Note that (6/3)⁴ + (8/2)⁵ + (9/1)⁷ is the only distinct solution for 4784009. [De Geest]