1817
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1920
- Proper Divisor Sum (Aliquot Sum)
- 103
- 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
- 1716
- Möbius Function
- 1
- Radical
- 1817
- Omega Function (Ω)
- 2
- 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
- 68
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Number of free planar polyenoids with n nodes.at n=10A000942
- Numbers of the form (p^2 - 49)/120 where p is prime.at n=45A002382
- Numbers that are the sum of 6 positive 5th powers.at n=45A003351
- Coordination sequence T2 for Zeolite Code RSN.at n=28A009886
- a(0) = 1, a(n) = 15*n^2 + 2 for n>0.at n=11A010005
- Numbers k such that phi(k + 13) | sigma(k).at n=49A015833
- Numbers k such that sigma(k) = sigma(k+12).at n=19A015882
- Coordination sequence T2 for Zeolite Code OSI.at n=28A016431
- Coordination sequence T8 for Zeolite Code TER.at n=29A016440
- Expansion of 1/(1-x^3-x^4-x^5-x^6-x^7).at n=26A017820
- Numbers k such that the continued fraction for sqrt(k) has period 28.at n=31A020367
- Fibonacci sequence beginning 1, 12.at n=12A022102
- Coordination sequence T4 for Zeolite Code IFR.at n=30A024985
- a(n) = d(n)/2, where d = A026040.at n=19A026041
- a(n) = T(2n-1,n), where T is the array in A026098.at n=21A026102
- Number of partitions of n into an odd number of parts, the least being 5; also, a(n+5) = number of partitions of n into an even number of parts, each >=5.at n=62A027191
- "DFK" (bracelet, size, unlabeled) transform of 1,2,3,4...at n=14A032216
- Incrementally largest terms in the continued fraction for zeta(3).at n=11A033166
- Multiplicity of highest weight (or singular) vectors associated with character chi_4 of Monster module.at n=41A034392
- Number of ternary rooted trees with n nodes and height exactly 12.at n=16A036427