434

This number is a composite.

+ A palindrome that produces a Composed prime: 434 = 2 x 7 x 31 and 42 + 37 + 431 = 4611686018427390107 is prime. [De Geest]

+ 434 is also the sum of the cubes of the digits of the emirp 347. [Trotter]

+ The smallest composite number n which satisfy the equation sigma(n+2) = sigma(n)+2, where sigma(n) is sum of divisors of n. [Gupta]

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