On many calculators, the MODE key/button is to set the calculator into degrees or radian angle measurment, that is, when you enter a value, it and all further values you enter will then either be understood by the calculator as a degrees or radian value for an angle.
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press the reset button on the back of the calculator that worked for me
Either enter 1800000 or 1.8 * 106 Usually the second form will need to be entered with the calculator set to scientific mode. The exact key sequence will depend on the calculator.
seven (7)
If you have Windows 7, as do I, then change the calculator to scientific mode, and there is a cube roots button, type in the number you want, and hit that button. If you are talking about a standard handheld calculator, most don't have it, but the TI scientific ones do!
Most scientific calculators can do this sort of conversion - including the scientific calculator included in Windows (set the mode to "Scientific" or to "Programmer", depending on the version). If you need help using your calculator, or if you want to learn how to do the calculation without a calculator, ask a separate question about that.