142,857

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Number

$142 \, 857$ (one hundred and forty-two thousand, eight hundred and fifty-seven) is:

$3^3 \times 11 \times 13 \times 37$

The $25$th Kaprekar number after $1, 9, 45, 55, 99, 297, \ldots, 38962, 77 \, 778, 82 \, 656, 95 \, 121, 99 \, 999$:

$142 \, 857^2 = 20 \, 408 \, 122 \, 449 \to 20 \, 408 + 122 \, 449 = 142 \, 857$

The recurring part of the decimal expansion of the reciprocal of $7$:

$\dfrac 1 7 = 0 \cdotp \dot 14285 \dot 7$

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Also see

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Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $297$
• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $142,857$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $297$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $142,857$