07. KNOWING OUR NUMBERS
Explanation:
6034579
The digits in the given number 6350947 are 6, 3, 5, 0, 9, 4 and 7.
Keeping the digit 6 at ten lakh’s place, the rest of the digits fill other places like lakh, ten thousands, thousand, hundreds, tens and ones place by decreasing order of remaining number, i.e. 0, 3, 4, 5, 7, 9.
Hence, the required smallest number is 6034579.