2798
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4200
- Proper Divisor Sum (Aliquot Sum)
- 1402
- 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
- 1398
- Möbius Function
- 1
- Radical
- 2798
- 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
- 66
- 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
- yes
- Odd
- no
Appears in sequences
- Number of monosubstituted alkanes C(n)H(2n+1)-X of the form shown in the Comments lines that are not stereoisomers.at n=18A000624
- Coordination sequence T1 for Zeolite Code AEI.at n=40A008001
- a(n) = a(n-3) + a(n-4), with a(0)=1, a(1)=a(2)=0, a(3)=1.at n=46A017817
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite RON = Roggianite Ca16[Be8Al16Si32O104(OH)16].19H2O starting with a T3 atom.at n=11A019215
- a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027052.at n=7A027078
- 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 52.at n=5A031550
- Numbers k such that 235*2^k+1 is prime.at n=23A032494
- Number of partitions satisfying cn(0,5) + cn(2,5) + cn(3,5) <= cn(1,5) and cn(0,5) + cn(2,5) + cn(3,5) <= cn(4,5).at n=37A039908
- Numbers n such that string 4,8 occurs in the base 9 representation of n but not of n-1.at n=38A044295
- Numbers n such that string 9,8 occurs in the base 10 representation of n but not of n-1.at n=29A044430
- Numbers n such that string 4,8 occurs in the base 9 representation of n but not of n+1.at n=38A044676
- Numbers n such that string 7,4 occurs in the base 9 representation of n but not of n+1.at n=37A044699
- Numbers n such that string 9,8 occurs in the base 10 representation of n but not of n+1.at n=29A044811
- Numbers whose base-4 representation contains exactly four 2's and two 3's.at n=4A045155
- a(n) = Sum_{i=0..n} T(i,n-i) where T is A049627.at n=29A049628
- Number of step shifted (decimated) sequences using exactly two different symbols.at n=13A056376
- Number of compositions of n such that two adjacent parts are not equal modulo 2.at n=21A062200
- Nearest integer to log(n^n)^log(1 + log(n)).at n=42A062434
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 96 ).at n=26A063369
- Numbers that in base 2 need eleven 'Reverse and Add' steps to reach a palindrome.at n=36A066132