The factorization of 836 is22 × 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 anabundant number, but no subset sums to 836, so it is not asemiperfect number; therefore it is aweird number.[1] Besides, 836 is the smallest weird number that is also anuntouchable number, i.e. there is non such that the sum of proper factors ofn equals 836. (The only smaller weird number,70, is not untouchable, since σ(134) − 134 = 70)
