123 (number)

123 (one hundred [and] twenty-three) is the natural number following 122 and preceding 124. After 1 and 12 it is the 3rd number to be concatenation of first n integers. Here n=3.

← 122 123 124 →
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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	11110112
Ternary	111203
Octal	1738
Duodecimal	A312
Hexadecimal	7B16

In mathematics

• 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 = 11² + 2 = 5³ - 2).[3]

In religion

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

In telephony

• The emergency telephone number in Colombia
• The telephone number of the speaking clock for the correct time in the United Kingdom
• The electricity (PLN) 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

123 is also:

• 123 (film), a 2002 Indian film
• 123 (interbank network), shared cash network in Egypt
• 123 (New Jersey bus)
• "1-2-3", 1965 song written and recorded by Len Barry
• The atomic number of the yet-to-be-discovered element unbitrium

See also

• 1-2-3 (disambiguation)
• 123rd (disambiguation)
• AD 123
• 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

1. 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.
2. "Mian-Chowla Sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-04-19. Retrieved 2016-04-19.
3. Conrad, Keith. "Examples of Mordell's Equation" (PDF). University of Connecticut, Mathematics Department. Retrieved 2017-06-24.
4. Numbers 33:39