9584
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 10
- Divisor Sum
- 18600
- Proper Divisor Sum (Aliquot Sum)
- 9016
- 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
- 4784
- Möbius Function
- 0
- Radical
- 1198
- Omega Function (Ω)
- 5
- 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
- 122
- 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
- a(1) = 7; a(n+1) = a(n)-th composite.at n=31A025011
- Numbers k such that 51*2^k+1 is prime.at n=32A032375
- Number of rooted identity trees with 2-colored nodes.at n=7A038077
- Numbers k such that k divides prime(k^2)+1.at n=22A067853
- Numbers k such that sigma(k) is a harmonic number.at n=39A074245
- Discriminant of the polynomial x^n - x^(n-1) - ... - x - 1.at n=4A106273
- Triangle T(n,k) of elements of n-th Weyl group of type B whose reduced word uses n-k generators.at n=49A109281
- Analog of A060410 for the 7x+1 problem (cf. A133421).at n=4A133426
- Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k UDDU's starting at level 1.at n=46A135328
- Maximum coefficient of the polynomial (-1)^(n+1)*Product_{k=1..n} (1 - x^k)^2.at n=24A156082
- Numbers that are not the sum of two squares and two fourth powers.at n=15A214891
- Number of (2,0)-separable partitions of n; see Comments.at n=52A239482
- Number of partitions p of n such that (maximal multiplicity of the parts of p) < (maximal part of p).at n=34A240310
- a(n) = 7*n^2 + 1.at n=37A247541
- Number of length 3+2 0..n arrays with the sum of medians of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=8A253131
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 81", based on the 5-celled von Neumann neighborhood.at n=23A270100
- Numbers n such that the decimal number concat(2,n) is a square.at n=40A273357
- Zero together with the partial sums of A056640.at n=15A274772
- Number of ways to write n as an ordered sum of 8 nonprime numbers.at n=23A341485
- Maximal coefficient of (1 - x)^2 * (1 - x^2)^2 * (1 - x^3)^2 * ... * (1 - x^n)^2.at n=25A369710