8,388,607

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Number

$8 \, 388 \, 607$ (eight million, three hundred and eighty-eight thousand, six hundred and seven) is:

$47 \times 178 \, 481$

The $2$nd Mersenne number after $2047$ which is composite:

$8 \, 388 \, 607 = 2^{23} - 1 = 47 \times 178 \, 481$

The $9$th Mersenne number after $3$, $7$, $31$, $127$, $2047$, $8191$, $131 \, 071$, $524 \, 287$:

$8 \, 388 \, 607 = 2^{23} - 1$

Historical Note

$8 \, 388 \, 607$ was the $2$nd Mersenne number to be demonstrated composite.

This was done in $1640$ by Pierre de Fermat, who demonstrated it had $47$ as a divisor.

Also see

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