1814
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2724
- Proper Divisor Sum (Aliquot Sum)
- 910
- 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
- 906
- Möbius Function
- 1
- Radical
- 1814
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 55
- 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
- yes
- Odd
- no
Appears in sequences
- Fibonacci numbers written backwards.at n=19A004091
- Reversals of Fibonacci numbers (sorted).at n=17A004170
- Generalized Fibonacci numbers A_{n,2}.at n=25A006207
- Coordination sequence T1 for Zeolite Code AFO.at n=28A008015
- Coordination sequence T3 for Zeolite Code DOH.at n=26A008080
- Coordination sequence T3 for Zeolite Code FER.at n=26A008108
- Coordination sequence T10 for Zeolite Code MFI.at n=27A008162
- Coordination sequence T12 for Zeolite Code MFI.at n=27A008164
- Coordination sequence T6 for Zeolite Code MFI.at n=27A008169
- Coordination sequence T4 for Zeolite Code MTW.at n=28A008199
- Number of integer points (x,y,z) at distance <= 0.5 from sphere of radius n.at n=12A016728
- Numbers k such that the continued fraction for sqrt(k) has period 34.at n=10A020373
- Ordered sequence of distinct terms of the form floor(x^i * floor(x^j)), i,j >= 0, where x = sqrt(7).at n=20A022771
- a(n) = Sum_{k=1..n} floor((n/k)*floor(n/k)).at n=33A024921
- a(n) = n^2 + n + 8.at n=42A027693
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 42.at n=3A031540
- Numbers whose set of base-6 digits is {1,2}.at n=45A032927
- Lower of pair of consecutive happy numbers.at n=37A035502
- Trajectory of 3 under map n->49n+1 if n odd, n->n/2 if n even.at n=4A037122
- Numbers whose maximal base-6 run length is 4.at n=11A037987