849 is 676 greater than 173.
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It is 849.
This can be done easily by expanding 849: 849 = 800+40+9 800 = DCCC ; 40 = XL ; 9 = IX 849 = DCCCXLIX
40.4286
No integer squared is equal to 849, but the square root of 849 is 29.138 (5sf)
849 = 8.49 x 10^2