2845
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3420
- Proper Divisor Sum (Aliquot Sum)
- 575
- 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
- 2272
- Möbius Function
- 1
- Radical
- 2845
- 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
- 66
- 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
- no
- Odd
- yes
Appears in sequences
- Positions of remoteness 6 in Beans-Don't-Talk.at n=36A005694
- Coordination sequence T1 for Zeolite Code AWW.at n=38A008045
- Pseudoprimes to base 86.at n=25A020214
- Sum of squares of first n positive integers congruent to 1 mod 3.at n=9A024215
- Multiplicity of highest weight (or singular) vectors associated with character chi_6 of Monster module.at n=40A034394
- Number of partitions of n into parts not of form 4k+2, 12k, 12k+5 or 12k-5.at n=47A036019
- Positive numbers having the same set of digits in base 4 and base 7.at n=46A037425
- Number of partitions satisfying cn(1,5) + cn(4,5) <= 1.at n=38A039856
- Number of partitions satisfying cn(0,5) + cn(1,5) + cn(4,5) < cn(2,5) + cn(3,5).at n=32A039880
- Numerators of continued fraction convergents to sqrt(535).at n=5A042022
- Denominators of continued fraction convergents to sqrt(571).at n=9A042095
- Numbers k such that string 1,1 occurs in the base 9 representation of k but not of k-1.at n=35A044261
- Numbers n such that string 4,5 occurs in the base 10 representation of n but not of n-1.at n=31A044377
- Numbers k such that string 1,1 occurs in the base 9 representation of k but not of k+1.at n=35A044642
- Numbers n such that string 4,5 occurs in the base 10 representation of n but not of n+1.at n=31A044758
- a(n)=T(n,2), array T as in A049735.at n=30A049745
- Starting positions of strings of 2 4's in the decimal expansion of Pi.at n=25A050230
- Molien series for group G_{1,2}^{8} of order 1536.at n=18A051462
- Sum of numbers in range 10*n to 10*n+9.at n=28A053743
- Number of homeomorphically irreducible general graphs on 5 labeled nodes and with n edges.at n=5A060580