13786
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 21204
- Proper Divisor Sum (Aliquot Sum)
- 7418
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6720
- Möbius Function
- -1
- Radical
- 13786
- 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
- 58
- 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
- yes
- Odd
- no
Appears in sequences
- Symmetries in planted 4-trees on n+1 vertices.at n=11A003615
- Numbers whose set of base-15 digits is {1,4}.at n=24A032827
- a(1) = 1; a(n) = tau(n) - tau(n-1)* a(n-1) if n > 1.at n=11A079898
- Molien series for group of order 4608 acting on joint weight enumerators of a pair of binary doubly-even self-dual codes.at n=45A097870
- Difference between the number of semiprimes less than 10^n and the number of primes less than 10^n.at n=5A194895
- Number of (n+1) X 2 0..2 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.at n=6A204833
- Number of (n+1)X8 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero.at n=0A204839
- T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero.at n=21A204840
- T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero.at n=27A204840
- Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>n.at n=24A211640
- Number of compositions of n in which the maximal multiplicity of parts equals 7.at n=11A243124
- G.f. satisfies: A(x) = (1-x^2) * (1 + x*A(x)^2).at n=12A259206
- Number of trapezoidal words of length n.at n=44A260881
- MM-numbers of capturing, non-nesting multiset partitions (with empty parts allowed).at n=19A326260
- Ordered perimeters p of primitive Pythagorean triangles no side of which is squarefree.at n=24A329392
- Number of free linear midpoint-free polycubes of size n, identifying rotations and reflections.at n=24A368032
- a(n) is the largest number t such that there exist numbers i,j,k such that, for all m <= t, there exist integers x,y,z with x*i + y*j + z*k = m and |x|+|y|+|z| <= n.at n=32A383579