Genesis 5:13

And after he became the father of Mahalalel, Kenan lived 840 years and had other sons and daughters.

(New International Version)

Then Kenan lived eight hundred and forty years after he became the father of Mahalalel, and he had other sons and daughters.

(New American Standard Bible)

And Cainan lived after he begat Mahalaleel eight hundred and forty years, and begat sons and daughters:

(King James Version)