840

View full site to see MathJax equation

840 < 839 | 841 >
All Numbers
800	801	802	803	804	805	806	807	808	809
810	811	812	813	814	815	816	817	818	819
820	821	822	823	824	825	826	827	828	829
830	831	832	833	834	835	836	837	838	839
840	841	842	843	844	845	846	847	848	849
850	851	852	853	854	855	856	857	858	859
860	861	862	863	864	865	866	867	868	869
870	871	872	873	874	875	876	877	878	879
880	881	882	883	884	885	886	887	888	889
890	891	892	893	894	895	896	897	898	899

840 is the number following 839 and preceding 841.

Properties

• Its factors are 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420 and 840, making it a composite number.
• 840 is an even number .
• 840 is an unhappy number.
  

• 840 is abundant and superabundant.
  
• Its prime factorization is 2³ × 3¹ × 5¹ × 7¹.
  

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	29 ↑ 2
Scientific notation	8.4 x 102	8.401 x 102
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	7[3]	8[3]
Chained arrow notation	29 → 2
Bowers' Exploding Array Function/Bird's array notation	{29,2}
Fast-growing hierarchy	f2(6)	f2(7)
Hardy hierarchy	Hω(420)	Hω(420)
Middle-growing hierarchy	m(ω,9)	m(ω,10)
Hyper-E notation	E2.9243
Hyper-E notation (non-10 base)	\(E[29]2\)
Hyperfactorial array notation	6!	7!
X-Sequence Hyper-Exponential Notation	29{1}2
Steinhaus-Moser Notation	4[3]	5[3]
PlantStar's Debut Notation	[1]	[2]
H* function	H(-0.1)	H(-0)
Bashicu matrix system with respect to version 4	(0)[28]	(0)[29]
m(n) map	m(1)(4)	m(1)(5)
s(n) map	\(s(1)(\lambda x . x+1)(419)\)	\(s(1)(\lambda x . x+1)(420)\)