38 (number)
title: "38 (number)" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["integers"] topic_path: "general/integers" source: "https://en.wikipedia.org/wiki/38_(number)" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::data[format=table title="Infobox number"]
| Field | Value |
|---|---|
| number | 38 |
| divisor | 1, 2, 19, 38 |
| :: |
| number = 38 | divisor = 1, 2, 19, 38 38 (thirty-eight) is the natural number following 37 and preceding 39.
In mathematics
- 38! − 1 yields which is the 16th factorial prime.
- There is no answer to the equation φ(x) = 38, making 38 a nontotient.
- 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.
- The sum of each row of the only non-trivial (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
::figure[src="https://upload.wikimedia.org/wikipedia/commons/3/39/ColorBlindTest38.png" caption="88]] instead."] ::
Thirty-eight is also:
- 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 (0, 00, and 1 through 36; European roulette does not use the 00 slot and has only 37 slots)
- The Ishihara test is a color vision test consisting of 38 pseudoisochromatic plates.
- 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
- Gerald Ford, 38th President of the United States
- Arnold Schwarzenegger, 38th Governor of California, most recent Republican governor of California, and the second governor to be born outside of the United States
- Cats have a total of 38 chromosomes in their genome.
- Number used by Zane Smith and Front Row Motorsports to win the 2022 NASCAR Camping World Truck Series championship.
References
References
- {{Cite OEIS
- {{OEIS
- Higgins, Peter. (2008). "Number Story: From Counting to Cryptography". Copernicus.
- (5 August 2013). "National Geographic, Korea, and the 38th Parallel". National Geographic.
- Fluck, Daniel. "Color Blindness Tests". Colblinder.
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