# 123 (number)

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Cardinal | one hundred twenty-three | |||

Ordinal |
123rd (one hundred twenty-third) | |||

Factorization | 3 × 41 | |||

Divisors | 1, 3, 41, 123 | |||

Greek numeral | ΡΚΓ´ | |||

Roman numeral | CXXIII | |||

Binary |
1111011_{2} | |||

Ternary |
11120_{3} | |||

Quaternary |
1323_{4} | |||

Quinary |
443_{5} | |||

Senary |
323_{6} | |||

Octal |
173_{8} | |||

Duodecimal |
A3_{12} | |||

Hexadecimal |
7B_{16} | |||

Vigesimal |
63_{20} | |||

Base 36 |
3F_{36} |

**123** (**one hundred [and] twenty-three**) is the natural number following 122 and preceding 124.

## In mathematics[edit]

**123**is a Lucas number.^{[1]}It is the eleventh member of the Mian-Chowla sequence.^{[2]}- Along with 6, 123 is one of only two positive integers that is simultaneously two more than a perfect square and two less than a perfect cube (123 = 11
^{2}+ 2 = 5^{3}- 2).^{[3]}

## In religion[edit]

The Book of Numbers says that Aaron died at the age of 123.^{[4]}

## In telephony[edit]

- The emergency telephone number in Colombia
- The telephone number of the speaking clock for the correct time in the United Kingdom
- The electricity emergency telephone number in Indonesia
- The medical emergency telephone number in Egypt
- The Notation for national and international telephone numbers Recommendation ITU-T Recommendation E.123 defines a standard way to write telephone numbers, e-mail addresses, and web addresses

## In other fields[edit]

123 is also:

*123*(film), a 2002 Indian film- 123 (interbank network), shared cash network in Egypt
- 123 (New Jersey bus)
- 123 (song), 1965 song written and recorded by Len Barry
- The atomic number of the yet-to-be-discovered element unbitrium

## See also[edit]

- 1-2-3 (disambiguation)
- 123rd (disambiguation)
- 123 AD
- 123 BC
- List of highways numbered 123
- Section 123 Agreement of the U.S. Atomic Energy Act of 1954
- United Nations Security Council Resolution 123
- Japan Airlines Flight 123, world's deadliest single-aircraft accident in history
- Raz, Dwa, Trzy, Polish music band
- Raz, dwa, trzy (newspaper), Polish sports weekly
- Sonnet 123 by William Shakespeare
- The Lotus 1-2-3 spreadsheet program

## References[edit]

**^**Friedman, Erich (30 April 2005). "What's Special About This Number?". Stetson University. Archived from the original on 10 February 2010. Retrieved 2010-02-08.**^**"Mian-Chowla Sequence".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. 2016-04-19. Retrieved 2016-04-19.**^**Conrad, Keith. "Examples of Mordell's Equation" (PDF).*University of Connecticut, Mathematics Department*. Retrieved 2017-06-24.**^**Numbers 33:39