Well, somebody had to point this out...
Bender's serial number, 2716057 = 952 cubed + (-951) cubed Flexo's serial number, 3370318 = 119 cubed + 119 cubed
Feeling particularly lifeless, and having a new PC at my disposal (Athlon 800 MHz - why not do a little number crunching with it?), I bashed out a list of the sums of two cubes between those two numbers; there are 3719 of them between 2716057 and 3370318, and the probability of two Bender-class robots in that range of numbers both being expressable as the sum of two cubes is...well, 1, as technically any number is the sum of two cubes if you include irrational numbers. Actually, if limited to the sum of two cubes of integers, about 1 in 30,000.