1869
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2880
- Proper Divisor Sum (Aliquot Sum)
- 1011
- 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
- 1056
- Möbius Function
- -1
- Radical
- 1869
- 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
- 86
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers k such that (k^2 + k + 1)/19 is prime.at n=41A002643
- a(n) = 7*a(n-1) - a(n-2) + 4, with a(0) = 0, a(1) = 5.at n=4A003482
- Number of board configurations in Mu Torere (for one player).at n=7A005655
- a(n) = a(n-1) + a(n-6), with a(i) = 1 for i = 0..5.at n=33A005708
- a(n) = a(n-2) + a(n-3), with a(0) = 0, a(1) = 1, a(2) = 4.at n=26A007309
- Coordination sequence T3 for Zeolite Code AFS and BPH.at n=33A008025
- Coordination sequence T1 for Zeolite Code KFI.at n=33A008123
- Coordination sequence T1 for Zeolite Code LEV.at n=32A008127
- Coordination sequence T2 for Keatite.at n=24A009845
- Coordination sequence T2 for Zeolite Code -CLO.at n=38A009851
- Expansion of e.g.f. arctan(sin(x)*log(x+1)).at n=7A012283
- Expansion of e.g.f.: tanh(sin(x)*log(x+1)).at n=7A012286
- Convolution of Catalan numbers and squares.at n=8A014316
- Expansion of 1/(1 - x^6 - x^7 - x^8 - ...).at n=39A017900
- Pseudoprimes to base 34.at n=25A020162
- Pseudoprimes to base 55.at n=20A020183
- a(n) = n*(19*n + 1)/2.at n=14A022277
- Fibonacci sequence beginning 0, 21.at n=11A022355
- Number of labeled servers of dimension 9.at n=3A027396
- Numbers having period-14 7-digitized sequences.at n=38A031205