ISBN 9994391745 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 9994391745 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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Tiu ĉi paĝo en Esperanto (Unikodo)
Tiu cxi pagxo en Esperanto (x-igata)
ISBN prefix group: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-994391-74-5first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Portugal
ISBNas­su­med er­rorCatalogs for checking
989-43-9174-5second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Kenya*
ISBNas­su­med er­rorCatalogs for checking
9914391745third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Andorra*
ISBNas­su­med er­rorCatalogs for checking
99913947454th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Albania
ISBNas­su­med er­rorCatalogs for checking
99943-51-74-5sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
99943-914-4-5eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
99943-917-4-7tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
99943-917-5-5ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
99943-977-4-5seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Tajikistan
ISBNas­su­med er­rorCatalogs for checking
99947-917-4-5fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: [no known group prefix]
ISBNas­su­med er­rorCatalogs for checking
9999391745fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de

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