1729 is nontrivially palindromic in base 12.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a 2-Lehmer number, since φ(1729) divides (1729-1)2.
It is a cyclic number.
It is a Carmichael number.
It is a deceptive number, since it divides R1728.
It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 1729 = 13 + 123 = 93 + 103.
It is a nialpdrome in base 13.
It is a Zeisel number, with parameters (1, 6).
It is a Poulet number, since it divides 21728-1.
1729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.
It is an amenable number.
1729 is a wasteful number, since it uses less digits than its factorization.
1729 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 39.
The square root of 1729 is about 41.5812457726. The cubic root of 1729 is about 12.0023143684.
The spelling of 1729 in words is "one thousand, seven hundred twenty-nine".