1729 is the Ramanujan's favorite number because 1729 is the sum of two consecutive cubes.
12³+1³
1728+1= 1729
10³+9³
1000+729= 1729
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1729, the smallest number that can be expressed as a sum of a pair of cubes in two different ways.
ANSWER: 1729 is a composite number.It is divisible by 7.
It is 1729. Discovered by mathemagician Srinivas Ramanujan, 1729 is said to be the magic number because it is the sole number which can be expressed as the sum of the cubes of two different sets of numbers. Ramanujan's conclusions are summed up as under: 1) 10 3 + 9 3 = 1729 and 2) 12 3 + 1 3 = 1729.
(9*9*9) + (10*10*10)= 1000+729=1729
The Hardy-Ramanujan Number is 1729.