ISBN 9440000647 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 9440000647 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: French language
ISBNas­su­med er­rorCatalogs for checking
2-440-00064-7first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
94-040-0064-73rd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
94-400-0014-7eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
94-400-0062-7ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
94-400-0064-3tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
94-400-8064-7sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
94-403-0064-7fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
94-406-0004-75th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
94-410-0064-7fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
94-90000-64-7third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-00-0064-7second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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