1886
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
- 5
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3024
- Proper Divisor Sum (Aliquot Sum)
- 1138
- 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
- 880
- Möbius Function
- -1
- Radical
- 1886
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 37
- 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
- yes
- Odd
- no
Appears in sequences
- Number of symmetric filaments (strip polyominoes) with n square cells.at n=19A002014
- Coordination sequence T2 for Zeolite Code CAS.at n=26A008064
- Coordination sequence T1 for Zeolite Code MOR.at n=28A008182
- Numbers n such that phi(n + 9) | sigma(n) for n not congruent to 0 (mod 3).at n=33A015849
- Numbers whose base-9 representation is the juxtaposition of two identical strings.at n=22A020337
- Place where n-th 1 occurs in A023133.at n=34A022795
- Convolution of odd numbers and primes.at n=12A023662
- Number of partitions of n that do not contain 2 as a part.at n=30A027336
- a(n) = n*(n+5).at n=41A028557
- Quasi-Carmichael numbers to base -4: squarefree composites n such that prime p|n ==> p+4|n+4.at n=0A029564
- For n>0, a(n) is the least quasi-Carmichael number to base -n, extended to n=0 with the least composite squarefree integer.at n=4A029591
- 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 42.at n=11A031540
- "CFK" (necklace, size, unlabeled) transform of 2,2,2,2...at n=16A032139
- Numbers whose set of base-12 digits is {1,2}.at n=15A032932
- Numbers in which all pairs of consecutive base-9 digits differ by 3.at n=37A033080
- Multiplicity of highest weight (or singular) vectors associated with character chi_99 of Monster module.at n=43A034487
- Base-3 palindromes that start with 2.at n=41A043002
- Numbers k such that 6 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.at n=37A043256
- Numbers having three 2's in base 6.at n=35A043379
- Numbers whose base-7 representation contains exactly three 3's.at n=22A043407