9868
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 31
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 17276
- Proper Divisor Sum (Aliquot Sum)
- 7408
- 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
- 4932
- Möbius Function
- 0
- Radical
- 4934
- Omega Function (Ω)
- 3
- 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
- 135
- 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 non-cyclic hydrocarbons with n carbon atoms (excluding stereoisomers).at n=9A002986
- a(n) = 1 + Sum_{i=1..n} (n-i+1)*phi(i).at n=45A005598
- Numbers whose base-3 representation contains no 0's and exactly one 2.at n=39A044990
- Number of unlabeled, connected graphs on n vertices with no induced subgraph isomorphic to a paw, where the paw is the graph on 4 vertices, 3 of which form a triangle and the 4th vertex is adjacent to exactly one of those 3.at n=9A079572
- Maximal troughs in decimal expansions of Pi: positions of troughs equal to 8.at n=15A105276
- Powers of e^(1/e) rounded up.at n=25A107586
- Numbers m = Sum_{k=1..n} sigma(k)/k such that Sum_{k=1..n} sigma(k)/k is an integer for any k.at n=12A168132
- Numbers n with property that n^3+n^2+{3,5} are twin primes.at n=31A168254
- Partial sums of A118371.at n=44A173520
- Expansion of x^2*(1 + 2*x - x^2) / ((1 + x)*(1 - x - 4*x^2 + 2*x^3)).at n=13A173650
- Fundamental discriminants of real quadratic number fields with class number 7.at n=21A218157
- Positive integers m with 2^m*p(m) + 1 prime, where p(.) is the partition function (A000041).at n=25A236390
- Number of n X 1 0..3 arrays with no element equal to the sum modulo 4 of elements to its left or elements above it.at n=10A238768
- Beastly reciprocals, or numbers k such that digitsum(1/k) = 666.at n=23A244661
- Row sums of the triangular array A246696.at n=26A246697
- T(n,k) = 1/k! * Sum_{i=0..k} (-1)^(k-i) *C(k,i) * A258306(n,i); triangle T(n,k), n>=0, 0<=k<=floor(n/2), read by rows.at n=32A258307
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 421", based on the 5-celled von Neumann neighborhood.at n=23A272051
- Numbers that are nontrivially palindromic in three or more consecutive integer bases.at n=11A279093
- Expansion of Product_{k=1..9} theta_3(q^k), where theta_3() is the Jacobi theta function.at n=40A320241
- Numbers k such that 313*2^k+1 is prime.at n=11A322948