The first natural number is added to the even digits and the third root of 8 is subtracted from the odd digits of the number ‘834672945’. If a digit is odd as well as prime, then 2 is added to it. The final number is obtained by rearranging the resultant digits in a descending order. What is the remainder when the sum of the first three digits from the left of the final number is divided by the sum of the last three digits of the final number?