38 (number)

In mathematics

• 38! − 1 yields, which is the 16th factorial prime.
• There is no answer to the equation φ = 38, making 38 a nontotient.
• 38 is the sum of the squares of the first three primes.
• 37 and 38 are the first pair of consecutive positive integers not divisible by any of their digits.
• 38 is the largest even number which cannot be written as the sum of two odd composite numbers.
• There are only two normal magic hexagons, order 1 and order 3. The sum of each row of an order 3 magic hexagon is 38.

  In science

• The atomic number of strontium

  Astronomy

• The Messier object M38, a magnitude 7.0 open cluster in the constellation Auriga
• The New General Catalogue object NGC 38, a spiral galaxy in the constellation Pisces

  In other fields

• The 38th parallel north is the pre-Korean War boundary between North Korea and South Korea.
• The number of slots on an American roulette wheel
• The number of games that each team in a sports league with 20 teams that plays a full home-and-away schedule will play in a season. The most notable leagues that currently have a 38-game season are the top divisions of association football in England and Spain, respectively the Premier League and La Liga.
• Bill C-38 legalized same-sex marriage in Canada
• The number of years it took the Israelites to travel from Kadesh Barnea to the Zered valley in Deuteronomy.
• A "38" is often the name for a snub nose.38 caliber revolver
• The 38 class is the most famous class of steam locomotive used in New South Wales
• The number of the French department Isère
• The "over-38 rule" is a feature of the NBA salary cap that affects contracts of players who turn 38 during their deals.