1. The problem asks to find the sum of the encircled digits in the number 1743159, where the encircled digits are 735. 2. First, identify the encircled digits clearly: they are 7, 3, and 5. 3. Sum these digits by adding each one: $$7 + 3 + 5 = 15$$. 4. The sum of the encircled digits is 15. 5. The problem requests the answer in words, so the final answer is "fifteen".