13833
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 21060
- Proper Divisor Sum (Aliquot Sum)
- 7227
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8736
- Möbius Function
- 0
- Radical
- 4611
- Omega Function (Ω)
- 4
- 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
- 89
- 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
- no
- Odd
- yes
Appears in sequences
- Pseudoprimes to base 10.at n=37A005939
- Pseudoprimes to base 17.at n=34A020145
- Pseudoprimes to base 28.at n=39A020156
- Pseudoprimes to base 35.at n=30A020163
- Pseudoprimes to base 55.at n=41A020183
- Strong pseudoprimes to base 62.at n=20A020288
- Pisot sequence T(4,10), a(n) = floor(a(n-1)^2/a(n-2)).at n=9A020748
- Expansion of 1/((1-x)*(1-3*x)*(1-4*x)*(1-8*x)).at n=4A021374
- a(n) = (2*n+1)*(10*n+1).at n=26A033574
- a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i), array T as in A048149.at n=36A049714
- Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 6 sites wide.at n=37A058367
- Card-matching numbers (Dinner-Diner matching numbers).at n=22A059058
- Card-matching numbers (Dinner-Diner matching numbers).at n=15A059068
- Card-matching numbers (Dinner-Diner matching numbers).at n=4A059073
- Numbers k such that binomial(prime(k), k) is divisible by k^2.at n=38A081384
- Numbers n such that n is not the power of a prime and such that for every prime divisor p of n, p-1 divides n-1.at n=37A087442
- Composite numbers k that divide 3^k - 2^k - 1, excluding powers of 2, 3 and 7.at n=27A127073
- a(n) = n*(n+2)*(2*n-1)/3. Also, row sums of triangle A131422.at n=26A131423
- Numbers k such that k and k^2 use only the digits 1, 3, 5, 8 and 9.at n=7A137036
- Duplicate of A131423.at n=26A143371