Hi Endre,
The error is coming from the database field size, not from the SP Property component settings.
The price column in the SP Property database table is currently set with a maximum value that cannot store numbers above 999,999. To allow larger values, you need to increase the column type in the database.
Before making any changes, please create a database backup.
Please note that this is a database-level customization, so keep a backup before modifying the table structure. Also, future SP Property updates may overwrite database changes, so it is a good idea to keep track of this modification.
Regards.