1985

View full site to see MathJax equation

1985 < 1984 | 1986 >
All Numbers
1900	1901	1902	1903	1904	1905	1906	1907	1908	1909
1910	1911	1912	1913	1914	1915	1916	1917	1918	1919
1920	1921	1922	1923	1924	1925	1926	1927	1928	1929
1930	1931	1932	1933	1934	1935	1936	1937	1938	1939
1940	1941	1942	1943	1944	1945	1946	1947	1948	1949
1950	1951	1952	1953	1954	1955	1956	1957	1958	1959
1960	1961	1962	1963	1964	1965	1966	1967	1968	1969
1970	1971	1972	1973	1974	1975	1976	1977	1978	1979
1980	1981	1982	1983	1984	1985	1986	1987	1988	1989
1990	1991	1992	1993	1994	1995	1996	1997	1998	1999

1985 is the number following 1984 and preceding 1986.

Properties

• Its factors are 1, 5, 397 and 1985, making it a composite number. It is also a squarefree number.
• 1985 is an odd number .
• 1985 is an unhappy number.
  

• 1985 is a centered square number.
  
• 1985 is deficient.
  
• Its prime factorization is 5¹ × 397¹.
  

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	45 ↑ 2
Scientific notation	1.985 x 103	1.986 x 103
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	19[2]	20[2]
Chained arrow notation	45 → 2
Bowers' Exploding Array Function/Bird's array notation	{45,2}
Fast-growing hierarchy	f2(7)	f2(8)
Hardy hierarchy	Hω(992)	Hω(993)
Middle-growing hierarchy	m(ω,10)	m(ω,11)
Hyper-E notation	E3.2978
Hyper-E notation (non-10 base)	\(E[45]2\)
Hyperfactorial array notation	6!	7!
X-Sequence Hyper-Exponential Notation	45{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	\(s(1)(\lambda x . x+1)(991)\)	\(s(1)(\lambda x . x+1)(992)\)