If 817 = 7 909=9 453=3 the what is 1246 = ?

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If
817 = 7
909 = 9
453 = 3
Then what is 1246 = ?

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817 = 8+1+7 = 16 = 1+6 = 7
909 = 9+0+9 = 18 = 1+8 = 9
453 = 4+5+3 = 12 = 1+2 = 3
Similary,
1246 = 1+2+4+6 = 13 = 1+3 = 4
So Answer is 4.