9799
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 34
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10080
- Proper Divisor Sum (Aliquot Sum)
- 281
- 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
- 9520
- Möbius Function
- 1
- Radical
- 9799
- 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
- 47
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers n such that phi(n + 1) | sigma(n) for n congruent to 1 (mod 3).at n=29A015817
- 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 97.at n=38A031595
- Numbers having three 9's in base 10.at n=16A043527
- Numbers whose sum of the squares of divisors is also a square number.at n=10A046655
- Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 18 (most significant digit on right).at n=5A061971
- Numbers k such that the sum of unitary divisors of k^2 is a square.at n=10A064498
- Nonprimes m such that phi(m)*sigma(m) is divisible by m+1.at n=37A065148
- Shallow diagonal of triangular spiral in A051682.at n=23A081275
- Pell pseudoprimes: odd composite numbers n such that P(n)-Kronecker(2,n) is divisible by n.at n=17A099011
- Near-repdigit semiprimes with 9 as repeated digit.at n=17A105990
- a(n+3) = a(n+2) + 3*a(n+1) + a(n).at n=13A111352
- a(n) = a(n-1) + 2*n^2 with a(1) = 1.at n=23A112524
- n times n+4 gives the concatenation of two numbers m and m-8.at n=2A116235
- a(1) = a(2) = 1, a(n) = a(n-1) + A007947(a(n-2)) for n >= 3, i.e., a(n) = a(n-1) plus the largest squarefree divisor of a(n-2).at n=24A121367
- RMS numbers: numbers n such that root mean square of divisors of n is an integer.at n=9A140480
- Triangle T(n,k) = 2*binomial(n,k)^2 - 1, read by rows, 0<=k<=n.at n=40A141597
- a(n) = 8*n^2 - 1.at n=34A157914
- a(n) = 50*n^2 - 1.at n=13A157919
- a(n) = 392*n - 1.at n=24A158004
- Composite RMS numbers: composite numbers c such that root mean square of divisors of c is an integer.at n=5A158287