2893
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3168
- Proper Divisor Sum (Aliquot Sum)
- 275
- 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
- 2620
- Möbius Function
- 1
- Radical
- 2893
- 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
- 48
- 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
- a(n) = n^n - a(n-1), with a(1) = 1.at n=4A001099
- Molien series for A_5.at n=42A008628
- Composite n such that phi(n) * sigma(n) is one less than a square.at n=24A015709
- Odd composite n such that phi(n) * sigma(n) is one less than a square.at n=8A015722
- Initial pile sizes which guarantee a win for player 2 in a certain variant of Nim.at n=33A016741
- Numbers k such that the continued fraction for sqrt(k) has period 64.at n=6A020403
- Number of two-connected (or biconnected) planar graphs with n nodes.at n=8A021103
- Fibonacci sequence beginning 5, 17.at n=12A022141
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 22 ones.at n=34A031790
- Number of indecomposable binary [ n,4 ] codes without 0 columns.at n=13A034351
- a(n) = floor(T_(n+1)/T_(n)) where T_n is n-th tangential or "Zag" number (see A000182).at n=41A034972
- Number of partitions satisfying (cn(2,5) = cn(3,5) and cn(0,5) <= cn(1,5) and cn(0,5) <= cn(4,5) and cn(2,5) <= cn(1,5) and cn(2,5) <= cn(4,5)).at n=41A036811
- Schoenheim bound L_1(n,7,6).at n=11A036834
- Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,2.at n=4A037571
- Numerators of continued fraction convergents to sqrt(644).at n=7A042236
- Numbers having three 5's in base 8.at n=11A043443
- Numbers n such that string 9,3 occurs in the base 10 representation of n but not of n-1.at n=30A044425
- Numbers k such that the digit string 9,3 occurs in the base-10 representation of k but not of k+1.at n=30A044806
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=16A051965
- Semiprimes p1*p2 such that p2 mod p1 = 10, with p2 > p1.at n=18A064908