The sold chair was a "previously preserved example" of the chairs used by Hawking after anxiety, announced Christie's.
Hawking used this chair from the end of the 80's to the mid 90s until he could handle the chair manually.
A wheelchair is sold as a collector, not for medical use. The proceeds from the sale are donated to two charitable levels – the Stevens Hawking Foundation and the Motoro Neuron Courses Association.
At the University of Cambridge 1966 Hawking's original dissertation was sold at $ 767,000 (£ 675,500) in the same auction on the Internet. Other items, including the sweater, were auctioned for a total of $ 650,000 (€ 572,450).
The auctioneer, which included Aizek Newton, Charles Darwin and Albert Einstein, sold 52 pieces. Their total price exceeded $ 2.3 million (two million euros).
Houghton, 21, was diagnosed with amyotrophic lateral sclerosis, which made her move only to wheelchairs, but later she lost her ability to speak. Despite difficult illnesses, Hawking was actively involved in scientific and social life. He died on March 14 this year at 76 at home in Cambridge.