282

This number is a composite.

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282 is the sum of the first four Fermat primes (3, 5, 17, 257); notably, the sum of the first two (8) and the sum of the last two (274) each have exactly four divisors. [Ahmed]

282 is the smallest 3-digit palindrome whose sum of divisors is a perfect square: σ(282) = 576 = 24². It is also the product of the first 3 primes p (2, 3, 47) such that 5p is a sum of 3 consecutive primes (cf. A163488). [Ahmed]