2859
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3816
- Proper Divisor Sum (Aliquot Sum)
- 957
- 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
- 1904
- Möbius Function
- 1
- Radical
- 2859
- 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
- 79
- 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
- Coordination sequence T1 for Zeolite Code HEU.at n=35A008116
- a(n) = [ a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ], for n >= 3.at n=21A022859
- a(n) = position of the n-th n in A026400.at n=49A026403
- Number of partitions of n into distinct parts, the greatest being odd.at n=53A026837
- Number of partitions of n into distinct parts, the greatest being even.at n=53A026838
- Positions of record values in A030737.at n=47A030742
- 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 53.at n=5A031551
- Positive numbers having the same set of digits in base 6 and base 7.at n=34A033170
- Number of symmetric n X 3 crossword puzzle grids.at n=9A034185
- Numbers n such that string 2,6 occurs in the base 9 representation of n but not of n-1.at n=39A044275
- Numbers n such that string 5,9 occurs in the base 10 representation of n but not of n-1.at n=31A044391
- Numbers n such that string 2,6 occurs in the base 9 representation of n but not of n+1.at n=39A044656
- Numbers n such that string 5,9 occurs in the base 10 representation of n but not of n+1.at n=31A044772
- Numbers n such that string 8,5 occurs in the base 10 representation of n but not of n+1.at n=30A044798
- Numbers whose base-3 representation contains exactly three 0's and four 2's.at n=31A045008
- Numbers whose base-5 representation contains exactly one 1 and three 4's.at n=37A045254
- Numbers whose base-5 representation contains exactly one 2 and three 4's.at n=34A045284
- Discriminants of imaginary quadratic fields with class number 18 (negated).at n=21A046015
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 22.at n=29A051987
- Boris Stechkin's function.at n=19A055004