1.729
1.729 is a composite number, odd, a calendar year.
1729 is the famous taxicab number, the smallest number expressible as the sum of two positive cubes in two different ways:
\(1729 = 1^3 + 12^3 = 9^3 + 10^3\)
The story comes from G. H. Hardy visiting the ailing Ramanujan in hospital. Hardy remarked that he had arrived in cab number 1729, which seemed rather a dull number. Ramanujan immediately replied that, on the contrary, it was a very interesting number — the smallest expressible as the sum of two cubes in two different ways.
Propiedades
- Paridad
- Impar
- Cantidad de dígitos
- 4
- Suma de dígitos
- 19
- Raíz digital
- 1
- Palíndromo
- No
- Invertido
- 9.271
- Sucesión de Recamán
- a(1.198) = 1.729
- Cantidad de divisores
- 8
- σ(n) — suma de divisores
- 2.240
Primalidad
Prime factorization: 7 × 13 × 19
Divisores y múltiplos
Representaciones
- En palabras
- one thousand seven hundred twenty-nine
- Ordinal
- 1729th
- Numeral romano
- MDCCXXIX
- Binario
- 11011000001
- Octal
- 3301
- Hexadecimal
- 0x6C1
- Base64
- BsE=
También visto como
UTF-8 encoding: DB 81 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.193.
- Address
- 0.0.6.193
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.193
Unspecified address (0.0.0.0/8) — "this network" placeholder.