Owlet puzzle #1

Released Monday, July 6, 2026 UTC

1729

the answer for puzzle #1

The five clues

A four-digit natural number.
It has exactly 8 divisors.
It is the product of three distinct primes.
The sum of its digits equals 19.
Called the taxicab number: the smallest expressible as a sum of two cubes in two ways.

1729 = 1³+12³ = 9³+10³. Ramanujan mentioned it from a hospital bed to G.H. Hardy in 1918.