9428
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
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 16506
- Proper Divisor Sum (Aliquot Sum)
- 7078
- 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
- 4712
- Möbius Function
- 0
- Radical
- 4714
- 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
- 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(n)^2 is smallest square number starting with a string of n 8's.at n=3A034992
- Numbers whose base-5 representation contains exactly three 0's and two 3's.at n=32A045201
- Numbers whose square starts with 4 identical digits.at n=8A132391
- a(n) = n*(n+1) + (n+2)*(n+3) + (n+4)*(n+5) + (n+6)*(n+7).at n=45A217776
- Positions of peak values in A232221.at n=37A232359
- a(n) = 4*5^n - 3*4^n.at n=5A257285
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 35", based on the 5-celled von Neumann neighborhood.at n=23A269816
- Numbers k such that 5*10^k + 87 is prime.at n=26A271360
- Triangle T(n,m) by rows: The number of tatami tilings of a 2 X n grid with dimers and 2*m monomers.at n=50A272471
- Numbers k such that (5*10^k - 29)/3 is prime.at n=20A282505
- Numbers n with the property that n^2 contains a sequence of four or more consecutive 8's.at n=2A301938
- a(n) = [x^n] ((Sum_{k=0..n} (k+7)!*x^k)/(Sum_{k=0..n} (k+7)!*(-x)^k))^(1/8).at n=5A303569
- Numbers whose square starts with exactly 4 identical digits.at n=8A346940
- Discriminants of imaginary quadratic fields with class number 42 (negated).at n=34A351680
- a(1) = 1; a(n) = Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=38A361981