deficient

/dɪˈfɪʃənt/

adjective

  1. 1

    Lacking something essential; often construed with in.

  2. 2

    Insufficient or inadequate in amount.

  3. 3

    Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n)

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