1800

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1800 < 1799 | 1801 >
All Numbers
1800	1801	1802	1803	1804	1805	1806	1807	1808	1809
1810	1811	1812	1813	1814	1815	1816	1817	1818	1819
1820	1821	1822	1823	1824	1825	1826	1827	1828	1829
1830	1831	1832	1833	1834	1835	1836	1837	1838	1839
1840	1841	1842	1843	1844	1845	1846	1847	1848	1849
1850	1851	1852	1853	1854	1855	1856	1857	1858	1859
1860	1861	1862	1863	1864	1865	1866	1867	1868	1869
1870	1871	1872	1873	1874	1875	1876	1877	1878	1879
1880	1881	1882	1883	1884	1885	1886	1887	1888	1889
1890	1891	1892	1893	1894	1895	1896	1897	1898	1899

1800 is the number following 1799 and preceding 1801.

Properties

• Its factors are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 25, 30, 36, 40, 45, 50, 60, 72, 75, 90, 100, 120, 150, 180, 200, 225, 300, 360, 450, 600, 900 and 1800, making it a composite number.
• 1800 is an even number .
• 1800 is an unhappy number.
  

• 1800 is abundant.
  
• Its prime factorization is 2³ × 3² × 5².
  
• 1800 is a Harshad number, meaning it is divisible by the sum of its digits.
  

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	42 ↑ 2
Scientific notation	1.8 x 103	1.801 x 103
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	17[2]	18[2]
Chained arrow notation	42 → 2
Bowers' Exploding Array Function/Bird's array notation	{42,2}
Fast-growing hierarchy	f2(7)	f2(8)
Hardy hierarchy	Hω(900)	Hω(900)
Middle-growing hierarchy	m(ω,10)	m(ω,11)
Hyper-E notation	E3.2553
Hyper-E notation (non-10 base)	\(E[42]2\)
Hyperfactorial array notation	6!	7!
X-Sequence Hyper-Exponential Notation	42{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)[42]	(0)[43]
m(n) map	m(1)(4)	m(1)(5)
s(n) map	\(s(1)(\lambda x . x+1)(899)\)	\(s(1)(\lambda x . x+1)(900)\)