836 (number)
Encyclopedia
In mathematics
836 is a weird numberWeird number
In number theory, a weird number is a natural number that is abundant but not semiperfect.In other words, the sum of the proper divisors of the number is greater than the number, but no subset of those divisors sums to the number itself.- Examples :The smallest weird number is 70...
. Its factorization is 22 × 11 × 19, so its divisors are 2, 4, 11, 19, 22, 38, 44, 76, 209, and 418. They sum to 843. As this is greater than 836, it is an abundant number, but no subset sums to 836, so it is not a semiperfect number
Semiperfect number
In number theory, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. A semiperfect number that is equal to the sum of all its proper divisors is a perfect number....
; therefore it is weird.
See also
- 836836Year 836 was a leap year starting on Saturday of the Julian calendar.- Asia :* Abbasid caliph al-Mutasim establishes a new capital at Samarra, Iraq.- Europe :...
(year) - 836 Jole836 Jole-External links:*...
(asteroid) - 836th Air Division836th Air DivisionThe 836th Air Division is an inactive United States Air Force organization. Its last assignment was with Tactical Air Command, assigned to Twelfth Air Force, being stationed at Davis-Monthan Air Force Base, Arizona...
, an inactive United States Air Force organization - 836 Naval Air Squadron, a World War II organization in the British Navy
- Pi ArietisPi ArietisPi Arietis is a spectroscopic binary star system in the constellation Aries. It is approximately 603 light years from Earth....
, designated as object 836 in the Bright Star catalogue