2863
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3280
- Proper Divisor Sum (Aliquot Sum)
- 417
- 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
- 2448
- Möbius Function
- 1
- Radical
- 2863
- 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
- 79
- 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
- Number of bipartite partitions of n white objects and 2 black ones.at n=16A000291
- Number of sublattices of index n in generic 3-dimensional lattice.at n=52A001001
- Coordination sequence T1 for Zeolite Code AST.at n=39A008036
- Coordination sequence T2 for Zeolite Code EMT.at n=44A008087
- Coordination sequence T2 for Zeolite Code EPI.at n=34A008091
- Coordination sequence T1 for Zeolite Code ERI and OFF.at n=39A008093
- Coordination sequence T2 for Zeolite Code MFS.at n=33A008174
- Coordination sequence T4 for Zeolite Code MTW.at n=35A008199
- Coordination sequence for alpha-Mn, Position Mn3.at n=14A009952
- Iccanobif numbers: add reversal of a(n-1) to a(n-2).at n=18A014259
- Ceiling of Gamma(n+2/7)/Gamma(2/7).at n=8A020123
- Pseudoprimes to base 53.at n=30A020181
- Pseudoprimes to base 54.at n=16A020182
- Strong pseudoprimes to base 53.at n=7A020279
- Strong pseudoprimes to base 54.at n=6A020280
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = (primes).at n=47A024377
- a(n) = least m such that if r and s in {1/1, 1/3, 1/5, ..., 1/(2n-1)} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=29A024834
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = (primes).at n=46A025077
- a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 0, 1, 1, 0.at n=20A025250
- (d(n)-r(n))/5, where d = A006527 and r is the periodic sequence with fundamental period (4,1,4,0,1).at n=33A026036