44 (number)

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← 43 44 45 →
Cardinal forty-four
Ordinal 44th
(forty-fourth)
Factorization 22× 11
Divisors 1, 2, 4, 11, 22, 44
Greek numeral ΜΔ´
Roman numeral XLIV
Binary 1011002
Ternary 11223
Quaternary 2304
Quinary 1345
Senary 1126
Octal 548
Duodecimal 3812
Hexadecimal 2C16
Vigesimal 2420
Base 36 1836

44 (forty-four) is the natural number following 43 and preceding 45.

In mathematics[edit]

Forty-four is a tribonacci number,[1] an octahedral number[2] and the number of derangements of 5 items.[3]

Since the greatest prime factor of 442 + 1 = 1937 is 149 and thus more than 44 twice, 44 is a Størmer number.[4]

Given Euler's totient function, φ(44) = 20 and φ(69) = 44.

In decimal notation (base 10), 44 is a palindromic number and a happy number.[5]

In science[edit]

Astronomy[edit]

In technology[edit]

In other fields[edit]

Forty-four is:

Born from a foreign mother, his blood of ancient heroes,
And his name will be forty and four.

Historical years[edit]

AD 44, 44 BC, 1944, 2044, etc.

See also[edit]

References[edit]

  1. ^ "Sloane's A000073 : Tribonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  2. ^ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  3. ^ "Sloane's A000166 : Subfactorial or rencontres numbers, or derangements". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  4. ^ "Sloane's A005528 : Størmer numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  5. ^ "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  6. ^ "O martírio do preso número 44". Jornal Observador (in Portuguese). Retrieved 2017-01-15.