347 (three hundred [and] forty seven) is the natural number following 346 and preceding 348.
In mathematics 347 is the 69th prime number. It is also a twin prime with 349, a safe prime, a Higgs prime, and a Ramanujan prime. It is the smallest prime number which the product of its digits is equal to two times the number of digits times the sum of digits. If the digits are reversed, it becomes 743, which is also a prime, meaning that 347 is an emirp. 347 is a Friedman number, but since it is a prime, it is also a Friedman prime.
347 is a strictly non-palindromic number.
Other uses A human D-amino acid oxidase contains 347 amino acids.
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