1980

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1980 < 1979 | 1981 >
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1980 is the number following 1979 and preceding 1981.

Properties

• Its factors are 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 90, 99, 110, 132, 165, 180, 198, 220, 330, 396, 495, 660, 990 and 1980, making it a composite number. It is also a cubefree number.
• 1980 is an even number .
• 1980 is an unhappy number.
  

• 1980 is a pronic number.
  
• 1980 is abundant.
  
• Its prime factorization is 2² × 3² × 5¹ × 11¹.
  
• 1980 is a Harshad number, meaning it is divisible by the sum of its digits.
  

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	44 ↑ 2
Scientific notation	1.98 x 103	1.981 x 103
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	19[2]	20[2]
Chained arrow notation	44 → 2
Bowers' Exploding Array Function/Bird's array notation	{44,2}
Fast-growing hierarchy	f2(7)	f2(8)
Hardy hierarchy	Hω(990)	Hω(990)
Middle-growing hierarchy	m(ω,10)	m(ω,11)
Hyper-E notation	E3.2967
Hyper-E notation (non-10 base)	\(E[44]2\)
Hyperfactorial array notation	6!	7!
X-Sequence Hyper-Exponential Notation	44{1}2
Steinhaus-Moser Notation	4[3]	5[3]
PlantStar's Debut Notation	[1]	[2]
H* function	H(0)	H(0.1)
Bashicu matrix system with respect to version 4	(0)[44]	(0)[45]
m(n) map	m(1)(4)	m(1)(5)
s(n) map	\(s(1)(\lambda x . x+1)(989)\)	\(s(1)(\lambda x . x+1)(990)\)