2795
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3696
- Proper Divisor Sum (Aliquot Sum)
- 901
- 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
- 2016
- Möbius Function
- -1
- Radical
- 2795
- 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
- 66
- 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) = a(n-1) - 2*a(n-2) with a(0) = 2, a(1) = 1.at n=21A002249
- Second pentagonal numbers: a(n) = n*(3*n + 1)/2.at n=43A005449
- a(n) = (2^n+1)*(2^n+2)/6.at n=7A007581
- Coordination sequence T1 for Zeolite Code ATO.at n=35A008265
- Orders of cyclotomic polynomials containing a coefficient the absolute value of which is >= 3.at n=37A013591
- Number of 4's in all the partitions of n into distinct parts.at n=55A015739
- Number of partitions of n into distinct parts, none being 4.at n=52A015746
- Numbers whose base-2 representation is the juxtaposition of two identical strings.at n=42A020330
- Numbers whose base-4 representation is the juxtaposition of two identical strings.at n=42A020332
- Numbers whose base-8 representation is the juxtaposition of two identical strings.at n=42A020336
- Ordered sequence of distinct terms of the form floor(x^i * floor(x^j)), i,j >= 0, where x = sqrt(5).at n=25A022770
- a(n) = (d(n)-r(n))/5, where d = A026063 and r is the periodic sequence with fundamental period (1,4,0,0,0).at n=33A026065
- Triangle T read by rows: differences of Motzkin triangle (A026300).at n=72A026105
- a(n) = T(2n-1,n), where T is the array defined in A026105.at n=4A026111
- Numbers whose set of base-11 digits is {1,2}.at n=22A032931
- Second pentagonal numbers with odd index: a(n) = (2*n-1)*(3*n-1).at n=22A033568
- Numbers n such that fractional part of e^(Pi*sqrt(n)) > 0.99.at n=47A035484
- Numbers of the form k*(k+1)/6 for k = 2 or 3 modulo 6.at n=43A036499
- Number of partitions satisfying (cn(2,5) <= cn(1,5) and cn(3,5) <= cn(1,5) and cn(2,5) <= cn(4,5) and cn(3,5) <= cn(4,5)).at n=34A036802
- Number of partitions of 5n such that cn(1,5) = cn(4,5) < cn(0,5) <= cn(2,5) = cn(3,5).at n=10A036890