1832
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
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3450
- Proper Divisor Sum (Aliquot Sum)
- 1618
- 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
- 912
- Möbius Function
- 0
- Radical
- 458
- 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
- 37
- 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 cells of square lattice of edge 1/n inside quadrant of unit circle centered at 0.at n=48A001182
- Number of solutions to a linear inequality.at n=38A002797
- Number of ways of transforming a set of n indistinguishable objects into n singletons via a sequence of n-1 refinements.at n=9A002846
- Numbers k such that k, k+1 and k+2 have the same number of divisors.at n=31A005238
- Number of symmetry sites in all planted 3-trees with n nodes.at n=13A007136
- Number of lattice points inside circle of radius n is 4(a(n)+n)-3.at n=48A007882
- Coordination sequence T2 for Zeolite Code DAC.at n=27A008068
- Coordination sequence T2 for Zeolite Code NAT.at n=29A008204
- Coordination sequence T1 for Zeolite Code PHI.at n=31A008227
- If a, b in sequence, so is ab+8.at n=14A009331
- tan(log(x+1)-tanh(x)) = -1/2!*x^2+4/3!*x^3-6/4!*x^4+8/5!*x^5... .at n=5A013284
- Expansion of e.g.f. arctanh(log(x+1) - tanh(x)).at n=7A013290
- Numbers n such that n is a substring of its square in base 3 (written in base 10).at n=17A018827
- Squares on infinite chessboard at n moves from center using a {2,3} fairy knight.at n=28A018839
- Numbers k such that Fib(k) == 21 (mod k).at n=16A023179
- Sum of the numbers between the two n's in A026362.at n=22A026365
- Numbers k such that Hofstadter Q-sequence Q(k) (A005185) satisfies Q(k) = k/2.at n=28A027619
- 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 21.at n=14A031519
- Shifts left 2 places under "CGK" (necklace, element, unlabeled) transform.at n=16A032162
- GCD-convolution of squares A000290 with themselves.at n=46A033457