1926
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 4212
- Proper Divisor Sum (Aliquot Sum)
- 2286
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 636
- Möbius Function
- 0
- Radical
- 642
- Omega Function (Ω)
- 4
- 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
- yes
- 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
- 50
- 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
- Pentagonal numbers: a(n) = n*(3*n-1)/2.at n=36A000326
- Coordination sequence T2 for Zeolite Code ATV.at n=28A008044
- Coordination sequence T4 for Zeolite Code GOO.at n=30A008114
- Coordination sequence T1 for Zeolite Code JBW.at n=29A008121
- Coordination sequence T12 for Zeolite Code MFI.at n=28A008164
- Expansion of (1 + 2*x^2 + x^3)/((1 - x)^2*(1 - x^3)).at n=53A008822
- Expansion of 1/((1-x)^3*(1-x^3)^2).at n=21A011779
- a(n) = floor( n*(n-1)*(n-2)/14 ).at n=31A011896
- Super-3 Numbers (3n^3 contains substring '333' in its decimal expansion).at n=13A014569
- Even pentagonal numbers.at n=18A014633
- a(1)=1, a(n) = n*25^(n-1) + a(n-1).at n=2A014943
- Numbers n such that n divides n-th Lucas number A000032(n).at n=7A016089
- Expansion of 1/(1-x^7-x^8-x^9-x^10-x^11-x^12-x^13-x^14).at n=47A017863
- Numbers k such that the continued fraction for sqrt(k) has period 26.at n=43A020365
- [ (4th elementary symmetric function of S(n))/(2nd elementary symmetric function of S(n)) ], where S(n) = {first n+3 positive integers congruent to 1 mod 3}.at n=8A024223
- Least m such that if r and s in {1/2, 1/5, 1/8,..., 1/(3n-1)}, satisfy r < s, then r < k/m < s for some integer k.at n=29A024823
- a(n) = least m such that if r and s in {1/1, 1/3, 1/5, ..., 1/(2n-1)} satisfy r < s, then r < k/m < (k+2)/m < s for some integer k.at n=19A024841
- Number of plane regions after drawing (in general position) a convex n-gon and all its diagonals.at n=14A027927
- 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=14A031540
- "DHK[ 8 ]" (bracelet, identity, unlabeled, 8 parts) transform of 1,1,1,1,...at n=8A032249