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42 (number)

 

42 (number)

42 is the natural number following 41 and followed by 43.

Cardinal forty-two
Ordinal42nd (forty-second)
Factorization
Divisors 2, 3, 6, 7, 14, 21
Roman numeralXLII
Binary101010
Hexadecimal2A

In mathematics


This composite number's factorization makes it a sphenic number. It is also the third 15-gonal number, a Catalan number, a meandric number, an open meandric number, a Harshad number and a self number. It is bracketed by twin primes.

In astronomy

  • Messier object M42, a magnitude 5.0 diffuse nebula in the constellation Orion, also known as the Orion Nebula
  • The New General Catalogue object NGC 42, a spiral galaxy in the constellation Pegasus
  • The Saros number of the solar eclipse series which began on 1577 BC April 28 and ended on 297 BC June 5. The duration of Saros series 42 was 1280.1 years, and it contained 72 solar eclipses.
  • The Saros number of the lunar eclipse series which began on 1293 BC January 24 and ended on 59 April 15. The duration of Saros series 42 was 1352.2 years, and it contained 76 lunar eclipses.

    In religion

  • The number of men of Beth-azmaveth in the Census of men of Israel upon return from exile. (Holy Bible, Ezra 2:24)
  • The number of months the Beast will hold dominion over the Earth. (Holy Bible, Revelation 13:5)
  • The number of generations recorded between Abraham and Jesus in the Gospel of Matthew. (Holy Bible, Matthew 1:17)
  • The maximum total number received of any one present in the song The Twelve Days of Christmas.
  • There are 42 principles of Ma'at.

    In other fields

    Forty-two is also:



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