836 (number)

← 835 836 837 →
List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	eight hundred thirty-six
Ordinal	836th (eight hundred thirty-sixth)
Factorization	2^2 × 11 × 19
Greek numeral	ΩΛϚ´
Roman numeral	DCCCXXXVI
Binary	11010001002
Ternary	10102223
Senary	35126
Octal	15048
Duodecimal	59812
Hexadecimal	34416

836 (eight hundred [and] thirty-six) is the natural number following 835 and preceding 837.

In mathematics

The factorization of 836 is 2² × 11 × 19, 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.^[1] 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, an inactive United States Air Force organization
• 836 Naval Air Squadron, a World War II organization in the British Navy
• Pi Arietis, designated as object 836 in the Bright Star catalogue

References

1. "Sloane's A006037 : Weird numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.