1802
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2916
- Proper Divisor Sum (Aliquot Sum)
- 1114
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 832
- Möbius Function
- -1
- Radical
- 1802
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 55
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- Number of full sets of size n.at n=6A001192
- Number of points on surface of tetrahedron; coordination sequence for sodalite net (equals 2*n^2+2 for n > 0).at n=30A005893
- Coordination sequence T1 for Zeolite Code AEL.at n=28A008004
- Coordination sequence T2 for Zeolite Code EDI.at n=30A008085
- Coordination sequence T3 for Zeolite Code EMT.at n=35A008088
- Coordination sequence T3 for Zeolite Code MFI.at n=27A008166
- Coordination sequence T6 for Zeolite Code NES.at n=27A008210
- Coordination sequence T4 for Zeolite Code STI.at n=29A008237
- Coordination sequence T2 for Zeolite Code THO.at n=30A008239
- Coordination sequence for body-centered tetragonal lattice.at n=15A008527
- Molien series for alternating group Alt_8 (or A_8).at n=28A008631
- Coordination sequence for NiAs(2), As position.at n=20A009945
- Coordination sequence for NiAs(2), Ni position.at n=20A009946
- Coordination sequence for sigma-CrFe, Position Xd.at n=11A009959
- a(0) = 1, a(n) = 18*n^2 + 2 for n>0.at n=10A010008
- Number of 7's in all the partitions of n into distinct parts.at n=53A015742
- Number of partitions of n into distinct parts, none being 7.at n=47A015754
- a(n) = 1*t(n) + 2*t(n-1) + ... + k*t(n+1-k), where k=floor((n+1)/2) and t = A000032 (Lucas numbers).at n=11A023861
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (Lucas numbers).at n=10A024858
- a(n) = Sum_{k=1..n} (n-k) * floor(n/k).at n=25A024920