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r in (-oo:+oo)
1766250 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
1766250-(3.14*(4/3)*r^3) = 0
1766250-4.18666667*r^3 = 0
-4.18666667*r^3 = -1766250 // : -4.18666667
r^3 = 421874.99966411
r^3 = 421874.99966411 // ^ 1/3
r = 421874.99966411^(1/3)
r = 421874.99966411^(1/3)
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