347 (number)

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← 346 347 348 →
Cardinal three hundred forty-seven
Ordinal 347th
(three hundred forty-seventh)
Factorization prime
Divisors 1, 347
Greek numeral ΤΜΖ´
Roman numeral CCCXLVII, cccxlvii
Binary 1010110112
Ternary 1102123
Senary 13356
Octal 5338
Duodecimal 24B12
Hexadecimal 15B16

347 (three hundred [and] forty seven) is the natural number following 346 and preceding 348.

Contents

In mathematics

347 is the 69th prime number. It is also a twin prime with 349, a safe prime, [1] a Higgs prime, and a Ramanujan prime. [2] 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. [3] If the digits are reversed, it becomes 743, which is also a prime, meaning that 347 is an emirp. [4] 347 is a Friedman number, but since it is a prime, it is also a Friedman prime. [5]

347 is a strictly non-palindromic number. [6]

Other uses

References

  1. ↑ Vanovschi, Vitalii. "Properties of the number 347". www.numberempire.com. Retrieved 2026-09-03.
  2. ↑ Sloane, N. J. A. (ed.). "SequenceA104272(Ramanujan primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  3. ↑ Khovanova, Tanya. "Unique Properties of 347". Number Gossip. Retrieved 2026-09-04.
  4. ↑ Weisstein, Eric W. "Emirp". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-09-04.
  5. ↑ Erich, Friedman. "Math Magic". erich-friedman.github.io. Retrieved 2026-09-04.
  6. ↑ Sloane, N. J. A. (ed.). "SequenceA016038(Strictly non-palindromic numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  7. ↑ Sloane, N. J. A. (ed.). "SequenceA079485(Number of chess games that end in checkmate after exactly n plies)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  8. ↑ Labelle, François. "Statistics on chess games". wismuth.com. Retrieved 2026-10-18.
  9. ↑ Stanley, R. P. "Extremal Problems" (PDF). MIT Mathematics. Retrieved 2026-10-19.
  10. ↑ Pollegioni, Loredano; Sacchi, Silvia; Murtas, Giulia (2018). "Human D-Amino Acid Oxidase: Structure, Function, and Regulation". Frontiers in Molecular Biosciences. 5: 107. doi: 10.3389/fmolb.2018.00107 . ISSN   2296-889X. PMC   6279847 . PMID   30547037.
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