Convert the following to Hindu-Arabic Numerals.

1. \(6 \times 10^{2}+2 \times 10^{1}+1 \times 10^{0}\)

2. \(3 \times 10^{3}+2 \times 10^{2}+0 \times 10^{1}+3 \times 10^{0}\)

3. \(4 \times 10^{7}+0 \times 10^{6}+6 \times 10^{5}+3 \times 10^{4}+0 \times 10^{3}+8 \times 10^{2}+9 \times 10^{1}+1 \times 10^{0}\)