1 significant figure. It can also be written as 4x10^6 (one sig fig)
1
Just the one and it is 4
4000000
One - the trailing zeros are not significant.
One. The zeros are just placeholders.
One - the zeros are placeholders unless indicated.
One significant figure.
This number has seven significant digits.
Three significant digits.
All four of the digits given are significant digits.
There are two significant digits in the number 83.
1,071 has four significant digits.