ISBN 9944881401 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 9944881401 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: English language
ISBNas­su­med er­rorCatalogs for checking
0-944881-49-11st and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-944881-40-91st and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Japan
ISBNas­su­med er­rorCatalogs for checking
4-944881-40-1first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Sweden
ISBNas­su­med er­rorCatalogs for checking
91-44-88140-1second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Montenegro
ISBNas­su­med er­rorCatalogs for checking
9940-8814-0-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Turkey
ISBNas­su­med er­rorCatalogs for checking
9944-781-40-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9944-81-140-86th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
9944-88-110-48th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
9944-88-120-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9944-88-140-6tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9944-88-148-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9944-88-540-1seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
9944-89-140-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Ghana
ISBNas­su­med er­rorCatalogs for checking
9964-88-140-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de

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