Write 12,400,000 in scientific notation

I'm not sure what the answer is and my dad's don't know either so- please help me ;-;

scientific notation A method of expressing numbers in terms of a decimal number between 1 and 10 multiplied by a power of 10. The scientific notation for 10,492, for example, is 1.0492 × 10 4.

1.24*10^7