189 (number)

In mathematics

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

• 189 can be written as sum of two cubes in two ways: 4³ + 5³ and 6³ + ³
• 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 Air Force Base, Arkansas
• 189th Infantry Brigade, an infantry brigade of the United States Army based at Fort Bragg
• was a Royal Australian Navy s 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
• is a United States Navy replenishment oiler
• was a United States Navy troop transport during the Korean War
• was a United States Navy during World War II
• was a United States Navy Alamosa-class cargo ship during World War II
• was a United States Navy during World War II
• was a United States Navy during World War II
• was a United States Navy during World War II

  In music

• The song "What a Beautiful Day" 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

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