9806
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14712
- Proper Divisor Sum (Aliquot Sum)
- 4906
- 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
- 4902
- Möbius Function
- 1
- Radical
- 9806
- 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
- 104
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 96.at n=19A020435
- 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 98.at n=13A031596
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 44 ones.at n=36A031812
- a(n) = 2*a(n-1) - a(n-2) + n + 1.at n=37A121968
- Binomial transform of [1, 3, 7, 0, 0, 0, ...].at n=53A140063
- Number of 2-separable partitions of n; see Comments.at n=48A239468
- Number of nX6 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=2A239598
- T(n,k)=Number of nXk 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=30A239599
- Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=5A239601
- Numbers n such that both n*log(2) and n*log(3) are within 1/sqrt(n) of integers.at n=34A259483
- Sum of divisors of the products of the smaller and larger parts of the partitions of n into two parts.at n=37A270528
- a(n) = (-1)^n * A294359(n) / (n+1)^2.at n=5A294475
- Consider the figure made up of a row of n adjacent congruent rectangles, with diagonals of all possible rectangles drawn; a(n) = number of interior vertices where exactly five lines cross.at n=48A336491
- Semiprimes of the form k^2 + 5.at n=33A361696
- Squarefree semiprimes (products of two distinct primes) between sphenic numbers (products of three distinct primes).at n=26A362507
- a(n) is the number of regions into which the plane is divided by n^2 circles of radius 1, the centers of which are located at the nodes of a square lattice n X n.at n=38A387883
- Even integers x such that x + sqrt(y) = sqrt(x || y), where || denotes decimal concatenation and y is a perfect square.at n=33A390123