836 (eight hundred
ndthirty-six) is the
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called '' cardinal ...
following
835
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Year 835 ( DCCCXXXV) was a common year starting on Friday (link will display the full calendar) of the Julian Calendar.
Events
By place Europe
* Ragnar Lodbrok, a Norse Viking ruler, rises to power. He becomes the scourge of ...
and preceding
837.
In mathematics
The factorization of 836 is , so its proper factors are 1, 2, 4, 11, 19, 22, 38, 44, 76, 209, and 418. They sum to 844. As this is greater than 836, it is an
abundant number, but no subset sums to 836, so it is not a
semiperfect number; therefore it is a
weird number.
Besides, 836 is the smallest weird number that is also an
untouchable number, i.e. there is no ''n'' such that the sum of proper factors of ''n'' equals 836. (The only smaller weird number
70 is not untouchable, since σ(134) − 134 = 70)
See also
*
836 (year)
*
836 Jole (asteroid)
*
836th Air Division
The 836th Air Division is an inactive United States Air Force organization. Its last assignment was with Tactical Air Command (TAC) at Davis-Monthan Air Force Base, Arizona, where it was inactivated on 1 May 1992. The division had been activa ...
, an inactive United States Air Force organization
*
836 Naval Air Squadron
836 Squadron was a squadron of the Royal Navy's Fleet Air Arm.
History
836 Naval Air Squadron officially formed for the first time at Palisadoes, Jamaica, in March 1942 as a torpedo bomber reconnaissance squadron flying the Fairey Swordfish. It ...
, a World War II organization in the British Navy
*
Pi Arietis, designated as object 836 in the Bright Star catalogue
References
Integers
{{Num-stub