# 1729 (number)

**1729 is the natural number following 1728 and preceding 1730. It is a taxicab number, and is variously known as Ramanujan’s number. 1729 is also the third Carmichael number, the first Chernick–Carmichael number and the first absolute Euler pseudoprime.**

### About 1729 (number) in brief

1729 is the natural number following 1728 and preceding 1730. It is a taxicab number, and is variously known as Ramanujan’s number. The number is named after an anecdote of the British mathematician G. H. Hardy. Hardy told Ramanujans that 1729 was the smallest number expressible as the sum of two cubes in two different ways.

1729 is also the third Carmichael number, the first Chernick–Carmichael number, and the first absolute Euler pseudoprime.

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