11208
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 28080
- Proper Divisor Sum (Aliquot Sum)
- 16872
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3728
- Möbius Function
- 0
- Radical
- 2802
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 99
- 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
- Numbers k such that sigma(k) = sigma(k+6).at n=27A015866
- Numerators of continued fraction convergents to sqrt(388).at n=6A041736
- Coefficients of the '3rd-order' mock theta function omega(q).at n=48A053253
- Number of solutions to n^2 < x^2 + y^2 + z^2 < (n+1)^2; number of lattice points between spheres of radii n and n+1.at n=30A078184
- Minimal positive solution z of Pell equation z^2 - A077426(n)*t^2 = -4.at n=12A078356
- Minimal positive solution a(n) of Pell equation a(n)^2 - D(n)*b(n)^2 = +4 or -4 with D(n)=A077425(n). The companion sequence is b(n)=A077058(n).at n=19A078361
- Number of plasma partitions of 2n-1.at n=50A095913
- Nearest integer to the n-th root of e leading to a generalized closed form for Zeta(s).at n=22A108925
- Positive numbers that are not the sum of two squares and a positive Fibonacci number.at n=36A115176
- Row sums of A125605.at n=21A125606
- Twice partition numbers.at n=30A139582
- Number of 3-element nondividing subsets of {1, 2, ..., n}.at n=43A187490
- Coefficient of x in the reduction by (x^2 -> x + 1) of the polynomial p(n,x) defined below at Comments.at n=9A192907
- Number of permutations of [n] with exactly two (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down).at n=8A228408
- Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of some of the consecutive step patterns UUD, UDU, DUU (U=up, D=down); triangle T(n,k), n>=0, 0<=k<=max(0,n-3), read by rows.at n=20A231384
- Number of Look-and-Say partitions of n; see Comments.at n=48A239455
- Terms of A143407, sorted.at n=22A270564
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 225", based on the 5-celled von Neumann neighborhood.at n=6A270943
- Number of matchings in the 2n-crossed prism graph.at n=4A293126
- Numbers k such that (26*10^k - 167)/3 is prime.at n=15A294678