123 (one hundred [and] twenty-three) is the natural number following 122 and preceding 124. In mathematics 123 is a Lucas number. It is the eleventh member of the Mian-Chowla sequence. 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). 123 is the first whole number containing numbers from 1 to 3 In religion The Book of Numbers says that Aaron died at the age of 123. 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 Integers