How would you write 4000000 in scientific notation

A shorthand method of writing very small and very large numbers is called scientific notation, in which we express numbers in terms of exponents of 10. To write a number in scientific notation, move the decimal point to the right of the first digit in the number. Write the digits as a decimal number between 1 and 10.

5,920 (five thousand nine hundred twenty) is an even four-digits composite number following 5919 and preceding 5921. In scientific notation, it is written as 5.92 × 10³.

108,000 (one hundred eight thousand) is an even six-digits composite number following 107999 and preceding 108001. In scientific notation, it is written as 1.08 × 10⁵.

25,000,000 written in scientific notation is 2.5 × 10⁷.

Here’s how it’s done: Put a decimal point after the first digit in 25,000,000 to get 2.5000000.