# 836 (number)

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 ← 835 836 837 →
Cardinal eight hundred thirty-six
Ordinal 836th
(eight hundred thirty-sixth)
Factorization 22× 11 × 19
Greek numeral ΩΛϚ´
Roman numeral DCCCXXXVI
Binary 11010001002
Ternary 10102223
Quaternary 310104
Quinary 113215
Senary 35126
Octal 15048
Duodecimal 59812
Hexadecimal 34416
Vigesimal 21G20
Base 36 N836

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 untouchable number, i.e. there is no n such that sum of proper factors of n equals 836. (the only smaller weird number 70 is not untouchable, since σ(134)−134=70)

## References

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