\({\dfrac{18^{3} + 7^{3} + 3 \times 18 \times 7 \times 25}{3^{6} + 6 \times 243 \times 2 + 15 \times 81 \times 4 + 20 \times 27 \times 8 + 15 \times 9 \times 16 + 6 \times 3 \times 32 + 64} = a}\)

Find the value of \(\Big[\frac{1439}{a}\Big]\)

Note- Don't use calculator

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