2908
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
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 5096
- Proper Divisor Sum (Aliquot Sum)
- 2188
- 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
- 1452
- Möbius Function
- 0
- Radical
- 1454
- Omega Function (Ω)
- 3
- 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
- no
- Squarefree Number
- no
- 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 n-input 3-output switching networks under action of AG(n,2) on the inputs and complementing group C(3,2) on the outputs.at n=2A000851
- Coordination sequence T4 for Zeolite Code DFO.at n=41A009878
- Number of lines through exactly 4 points of an n X n grid of points.at n=25A018811
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite HEU = Heulandite Ca4[Al8Si28O72].24H2O starting with a T2 atom.at n=11A019137
- a(n) = sum of the numbers between the two n's in A026358.at n=27A026361
- 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 26.at n=37A031524
- Decimal part of a(n)^(1/10) starts with n (10th powers excluded).at n=22A034065
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/10) starts with n.at n=22A034075
- Composite numbers whose prime factors contain no digits other than 2 and 7.at n=38A036312
- Matrix square of Stirling-1 triangle A008275.at n=16A039814
- Numbers n such that string 0,8 occurs in the base 10 representation of n but not of n-1.at n=30A044340
- Numbers n such that string 0,8 occurs in the base 10 representation of n but not of n+1.at n=30A044721
- a(n) = binomial(n,0) - binomial(n,2) + binomial(n,4).at n=18A058923
- Intrinsic 8-palindromes: n is an intrinsic k-palindrome if it is a k-digit palindrome in some base.at n=16A060878
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 88 ).at n=22A063361
- Number of orbits of the group of units of Z/(n) acting naturally on the 4-subsets of Z/(n).at n=30A063381
- Numbers n such that the area of the parallelogram formed by the vectors (n, prime(n)) and (n+1, prime(n+1)) is an integer square, i.e., Det[{{n, prime(n)},{n+1, prime(n+1)}}] is an integer square.at n=20A067805
- Centered 17-gonal numbers: (17*n^2 - 17*n + 2)/2.at n=18A069130
- Centered 19-gonal numbers.at n=17A069132
- Numbers of form 2^i*3^j - (i+j) with i, j >= 0.at n=49A069355