2168
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4080
- Proper Divisor Sum (Aliquot Sum)
- 1912
- 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
- 1080
- Möbius Function
- 0
- Radical
- 542
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 2
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
- 45
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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 inequivalent Costas arrays of order n under dihedral group.at n=13A001441
- Not integral, withdrawn.at n=6A002693
- Expansion of (1-x+x^2)/((1-x)^2*(1-x^2)*(1-x^4)).at n=44A005232
- Representation degeneracies for Neveu-Schwarz strings.at n=14A005297
- Number of n-step self-avoiding walks on hexagonal lattice from (0,0) to (0,3).at n=5A005549
- a(n) = 6*n^2 + 2 for n > 0, a(0)=1.at n=19A005897
- Coordination sequence for NiAs(1), As position.at n=19A009943
- a(n) = n*(17*n - 1)/2.at n=16A022274
- Numbers k such that Fib(k) == 21 (mod k).at n=18A023179
- Numbers with exactly 6 2's in their ternary expansion.at n=8A023704
- a(n) = Sum_{k=1..n} (n-k) * floor(n/k).at n=27A024920
- Number of partitions of n in which the least part is 5.at n=59A026798
- a(n) = n^2 + n + 6.at n=46A027691
- Number of T-frame polyominoes with n cells.at n=31A028247
- Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 2,0,1,3.at n=5A037716
- Even numbers k such that b(k) is greater than b(k-1) and b(k+1); b(k) = A033178(k).at n=31A038007
- Coordination sequence T5 for Zeolite Code SFF.at n=31A038436
- Numbers n such that n and n+1 are differences between 2 positive cubes in at least one way.at n=2A038594
- Even numbers that are differences between two cubes in at least one way.at n=41A038848
- Multiples of 4 that are the difference of two positive cubes.at n=27A038849