838
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1260
- Proper Divisor Sum (Aliquot Sum)
- 422
- 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
- 418
- Möbius Function
- 1
- Radical
- 838
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 41
- Smith 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
Names
- German
- achthundertachtunddreißig· ordinal: achthundertachtunddreißigste
- English
- eight hundred thirty-eight· ordinal: eight hundred thirty-eighth
- Spanish
- ochocientos treinta y ocho· ordinal: 838º
- French
- huit cent trente-huit· ordinal: huit cent trente-huitième
- Italian
- ottocentotrentotto· ordinal: 838º
- Latin
- octingenti triginta octo· ordinal: 838.
- Portuguese
- oitocentos e trinta e oito· ordinal: 838º
Appears in sequences
- Number of partitions into non-integral powers.at n=16A000148
- A generalized partition function.at n=10A002603
- The square sieve.at n=51A002960
- a(n) = floor((n^2 + 6n - 3)/4).at n=54A004116
- Certain subgraphs of a directed graph.at n=3A005332
- Coordination sequence T4 for Zeolite Code BRE.at n=19A008061
- Coordination sequence T1 for Zeolite Code MAZ.at n=20A008144
- Expansion of (1+2*x^3+x^5)/((1-x)^2*(1-x^5)).at n=45A008823
- "Pascal sweep" for k=10: draw a horizontal line through the 1 at C(k,0) in Pascal's triangle; rotate this line and record the sum of the numbers on it (excluding the initial 1).at n=10A009550
- Shallit sequence S(14,23), a(n)=[ a(n-1)^2/a(n-2)+1 ].at n=8A010923
- exp(sinh(x)+tan(x))=1+2*x+4/2!*x^2+11/3!*x^3+40/4!*x^4+169/5!*x^5...at n=6A013044
- cosh(sinh(x)+tan(x))=1+4/2!*x^2+40/4!*x^4+838/6!*x^6+30552/8!*x^8...at n=3A013053
- Pisot sequence E(10,21), a(n) = floor( a(n-1)^2/a(n-2)+1/2 ).at n=6A014007
- a(n) = a(n-1) + a(n-4), starting 1,1,1,3.at n=21A014101
- Imaginary Rabbits: imaginary part of a(0)=i; a(1)=-i; a(n) = a(n-1) + i*a(n-2), with i = sqrt(-1).at n=22A014291
- Numbers k such that phi(k) + 4 | sigma(k + 4).at n=37A015783
- Numbers k such that phi(k + 4) | sigma(k).at n=52A015820
- Numbers k such that phi(k + 4) | sigma(k) for k not congruent to 0 (mod 3).at n=41A015847
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AFX = SAPO-56 [Al23Si5P20O96] starting with a T1 atom.at n=4A018971
- X^m=X rings without normal forms: integers m > 1 for which there exist a prime p and integers a,b > 0 such that both p^a-1 and p^b-1 divide m-1 but p^lcm(a,b)-1 does not divide m-1.at n=46A019508