2818
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4230
- Proper Divisor Sum (Aliquot Sum)
- 1412
- 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
- 1408
- Möbius Function
- 1
- Radical
- 2818
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 84
- 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 partitions of n into at most 5 parts.at n=46A001401
- Number of partitions of n with at least 1 odd and 1 even part.at n=27A006477
- a(0) = 1, a(n) = 11*n^2 + 2 for n>0.at n=16A010003
- Number of triples (i,j,k) with 1 <= i < j < k <= n and gcd(i,j,k) = 1.at n=27A015616
- Number of triples of different integers from [ 2,n ] with no global factor.at n=27A015618
- Expansion of 1/(1-x^8-x^9-x^10-x^11-x^12-x^13-x^14-x^15-x^16-x^17-x^18).at n=52A017876
- Numbers k such that the continued fraction for sqrt(k) has period 40.at n=15A020379
- Position of numbers of form 3*n^2 in A025060 (numbers of form j*k + k*i + i*j, where 1 <=i < j < k).at n=27A025064
- Index of 6^n within the sequence of the numbers of the form 2^i*6^j.at n=46A025712
- Number of partitions of n in which the greatest part is 5.at n=51A026811
- 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=7A031550
- Number of partitions of n into parts 4k and 4k+2 with at least one part of each type.at n=54A035622
- Number of partitions of n into parts 6k and 6k+3 with at least one part of each type.at n=80A035639
- Number of partitions satisfying (cn(0,5) <= cn(1,5) = cn(4,5) and cn(1,5) <= cn(2,5) and cn(1,5) <= cn(3,5)).at n=46A036819
- Number of pairs {i,j}, i>1, j>1, such that ij < n^2.at n=31A037048
- Numbers n such that string 7,1 occurs in the base 9 representation of n but not of n-1.at n=38A044315
- Numbers n such that string 1,8 occurs in the base 10 representation of n but not of n-1.at n=31A044350
- Numbers n such that string 7,1 occurs in the base 9 representation of n but not of n+1.at n=38A044696
- Numbers n such that string 1,8 occurs in the base 10 representation of n but not of n+1.at n=31A044731
- Number of partitions of n with some part repeated.at n=27A047967