4899
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 30
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 6912
- Proper Divisor Sum (Aliquot Sum)
- 2013
- 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
- 3080
- Möbius Function
- -1
- Radical
- 4899
- Omega Function (Ω)
- 3
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 134
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- a(n) = 4*n^2 - 1.at n=35A000466
- a(n) = (4*n+1)*(4*n+3).at n=17A001539
- Coordination sequence T2 for Zeolite Code AFO.at n=46A008016
- Coordination sequence T1 for Zeolite Code MEL.at n=45A008150
- Pseudoprimes to base 70.at n=26A020198
- Generalized Catalan numbers: a(0) = 1, a(n) = a(n-1) + Sum_{k=1..n-4} a(k) * a(n-k).at n=13A023425
- a(n)/1000 gives sqrt(n) to 3 places after the decimal point.at n=23A027662
- a(1) = 1; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=38A033680
- a(n) = T(n,n-3), array T as in A055818.at n=27A055820
- Multiples of 3 that are one less than a perfect square.at n=46A057780
- Binomial transform of A054341 and inverse binomial transform of A049027.at n=7A059738
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 79 ).at n=19A063352
- a(n) = Sum_{k=1..n} Sum_{d=1..k} (k mod d).at n=44A072481
- Numbers k such that average of prime(k) and prime(k+1) is a perfect square.at n=31A076692
- Expansion of e.g.f. exp(3*x)*exp(x^2).at n=6A083886
- Number of ordered triples (i,j,k) with |i| + |j| + |k| <= n and gcd(i,j,k) <= 1.at n=16A100450
- Numbers k such that 7*10^k - 11 is prime.at n=14A102740
- Number of 2's in n-th "Kolakoski" string defined in A054349.at n=21A111123
- One third of the sum of the first n primes, when an integer.at n=23A112270
- Positive numbers of the form 4*n^2 - 1 which are not semiprimes.at n=27A123754