189 (number)

189 (one hundred [and] eighty-nine) is the natural number following 188 and preceding 190.

In mathematics

189 is:

• an odd number
• a centered cube number^[1]
• a composite number
• a deficient number, as 131 is less than 189
• a heptagonal number^[2]
• a lucky number
• a Ulam number
• a 64-gonal number
• a Kaprekar constant in base 2
• palindromic in bases 2 (10111101₂), 20 (99₂₀), 26 (77₂₆) and 62 (33₆₂).
• a Harshad number in bases 3, 4, 5, 6, 7, 11, 13, 15 (and 28 other bases).
• the sum of the sums of the divisors of the first 15 positive integers.^[3]

Also:

• 189 can be written as sum of two cubes in two ways: 4³ + 5³ and 6³ + (-3)³ (The smallest number that can be written as the sum of 2 positive only cubes in two ways is 1729)
• Divisors of 189: 1, 3, 7, 9, 21, 27, 63, 189

In astronomy

• 189 Phthia is a bright rocky main belt asteroid
• NGC 189 is an open cluster in the Cassiopeia constellation

In geography

• Lumsden No. 189, Saskatchewan in southwestern Saskatchewan, Canada

In the military

• 189th Airlift Squadron is a unit of the Idaho Air National Guard
• 189th Airlift Wing airlift unit, part of the Arkansas National Guard at Little Rock AFB, Arkansas
• 189th Infantry Brigade, an Infantry brigade of the United States Army based at Fort Bragg
• HMAS Pirie (J189) was a Royal Australian Navy Bathurst class corvettes during World War II
• LSMR-189 was a United States Navy landing ship medium during World War II
• No. 189 Squadron RAF was a Royal Air Force squadron during World War I
• USNS John Lenthall (T-AO-189) is a United States Navy Henry J. Kaiser class fleet replenishment oiler
• USNS Lt. Raymond O. Beaudoin (T-AP-189) was a United States Navy troop transport during the Korean War
• USS Bronstein (DE-189) was a United States Navy destroyer escort during World War II
• USS Hidalgo (AK-189) was a United States Navy Alamosa-class cargo ship during World War II
• USS Oxford (APA-189) was a United States Navy Haskell-class attack transport during World War II
• USS Saury (SS-189) was a United States Navy Sargo-class submarine during World War II
• USS Semmes (DD-189) was a United States Navy Clemson-class destroyer during World War II

In music

• The song What a Beautiful Day (2003) by Chris Cagle includes the lyrics, "Day 189. Oh, I almost lost that girl to my foolish pride"

In transportation

• London Buses route 189
• Air Canada Flight 189 flight from Ottawa to Vancouver crashed on takeoff on June 26, 1978
  • USA-189, an experimental satellite launched June 21, 2006
• DB AG electric locomotive class 189, a Siemens EuroSprinter ES64F4

In other fields

189 is also:

• The year AD 189 or 189 BC
• The atomic number of an element temporarily called Unoctennium
• Minuscule 189 is a Greek minuscule manuscript of the New Testament, on parchment

See also

• List of highways numbered 189
• United Nations Security Council Resolution 189
• United States Supreme Court cases, Volume 189
• Pennsylvania House of Representatives, District 189

External links

Wikimedia Commons has media related to 189 (number).

• Number Facts and Trivia: 189
• Prime curiosities: 189
• The Number 189
• Number Gossip: 189
• VirtueScience: 189

References

1. ↑ "Sloane's A005898 : Centered cube numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28. 
2. ↑ "Sloane's A000566 : Heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28. 
3. ↑ "Sloane's A024916 : sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.