If 137 + 276 =435 how much is 731 + 672 =?

Question

An integer x is selected in such a way that

x + x^(1/2) + x^(1/4) = 276

Then what would be the sum of all digits of the number y where

y = 100000 x^(1/4) + 1000 x^(1/2) + x 

Answer 1

Another answer is 1623, since 137+276=435 in octagonal form, and so similarly 731+672=1623

Answer 2

I think answer can be 534

Comments

Sorry but its not that much simple

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Simpler or not I think that answer is logical (reversing digit order). Maybe it is not the only one, but it can't be refused because of its simplicity.