40 Fun Facts About the Number 40

In honor of my 40th birthday, here are 40 fun facts about the number 40:

  1. 40 is the natural number following 39 and preceding 41.
  2. 40 is an even number.
  3. 40 is a composite number.
  4. 40 is a semiperfect number.
  5. 40 is an octagonal number.
  6. 40 is a pentagonal pyramidal number.
  7. 40 is a Harshad number.
  8. 40 is a Størmer number.
  9. The 7 factors of 40 are 1, 2, 4, 5, 8, 10, and 40.
  10. The square root of 40 is about 6.32456.
  11. -40 is the unique temperature at which the Fahrenheit and Celsius scales correspond.
  12. 40 is a repdigit in base 3 (1111).
  13. In horse racing, the maximum permitted number of runners in the grand national is 40.
  14. 40 years of marriage is the ruby wedding anniversary.
  15. 40 is the number of positions on a number of radio countdown programs, most notably American Top 40.
  16. In ancient Israel 40 lashes is one of the punishments meted out by the Sanhedrin, though in actual practice only 39 lashes were administered.
  17. “40” is a 1983 song by U2 from their album War.
  18. 40 is the atomic number for zirconium.
  19. The planet Venus forms a pentagram in the night sky every eight years with it returning to its original point every 40 years with a 40 day regression.
  20. The Messier object M40 is magnitude 9.0 double star in the constellation Ursa Major.
  21. The New General Catalogue object NGC 40 is a magnitude 12.4 planetary nebula in the constellation Cepheus.
  22. The Hebrew people lived in the Sinai desert for 40 years.
  23. In the Hebrew Bible, rain fell for 40 days and 40 nights during the Flood.
  24. 40 days was the period from the resurrection of Jesus to the ascension of Jesus.
  25. In Islam, the mourning period officially lasts for 40 days.
  26. In modern Christian practice, Lent consists of the 40 days preceding Easter.
  27. Before his temptation, Jesus fasted 40 days and 40 nights in the Judean desert.
  28. The Roman numeral for 40 is XL.
  29. 40 is the number of spaces in a standard Monopoly game board.
  30. Ronald Regan was the 40th president.
  31. I-40 is the U.S. Interstate Highway from Barstow, California to Wilmington, North Carolina.
  32. 40 is the only integer whose English name has its letters in alphabetical order.
  33. Some Russians believe that ghosts of the dead linger at the site of their death for 40 days.
  34. 40 is the highest number ever counted to on Sesame Street.
  35. In tennis, the number 40 represents the third point gained in a game.
  36. Pope Innocent I was the 40th pope.
  37. South Dakota was the 40th state to be admitted to the Union.
  38. 40 is the calling code assigned to Romania.
  39. 40 is the retired jersey number of former Arizona Cardinals football player and Army Ranger Pat Tillman.
  40. 40 in binary is 101000.

One thought on “40 Fun Facts About the Number 40

  1. Maria September 24, 2015 / 8:16 pm

    this was awesome it helped so much
    🙂

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