Penholodigital Properties of 987,654,321

Theorem
$987 \, 654 \, 321$ has the following properties:

It is penholodigital, and remains so when multiplied by $1$, $2$, $4$, $5$, $7$ and $8$:

Also:
 * $987 \, 654 \, 321 - 123 \, 456 \, 789 = 864 \, 197 \, 532$

which is also penholodigital.