8899
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 34
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 9720
- Proper Divisor Sum (Aliquot Sum)
- 821
- 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
- 8080
- Möbius Function
- 1
- Radical
- 8899
- 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
- 70
- 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
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AET = AlPO4-8 [Al36P36O144] starting with a T1 atom.at n=5A018948
- 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 93.at n=21A031591
- First differences give (essentially) A028242.at n=43A035107
- Summarize the previous term!, starting with 8899.at n=0A037192
- For each prime p take the sum of nonprimes < p.at n=34A045717
- Number of trees with n nodes and 5 leaves.at n=16A055292
- Integers n > 1997 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 1997.at n=14A063055
- Number of triples (i,j,k) with 1 <= i <= j < k <= n and gcd{i,j,k} = 1.at n=39A100448
- Nondecreasing sequence of integers where each digit d is part of a group of d identical digits.at n=76A113764
- Semiprimes (A001358) made of nontrivial runs of identical digits.at n=18A116063
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 0), (0, 0, -1), (0, 1, -1), (1, 0, 1)}.at n=8A149323
- a(n) = (p(n)*p(n+2) - 3*p(n+1))/2, where p(n) is the n-th odd prime.at n=30A152529
- a(n) = 9*n^2 - 10*n + 3.at n=32A154262
- Continued fraction for e^e^e A073227.at n=44A159825
- G.f.: x^3*(2*x-1) / ((1-x)*(1-x-x^2)*(1-2*x^2)).at n=21A174959
- Numbers with rounded up arithmetic mean of digits = 9.at n=22A178369
- Losing positions in Nim (misere) with up to 9 stones on each heap.at n=70A190588
- Number of n X 2 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.at n=20A229439
- Sequence has property that when divided into chunks by cutting it before each digit '1', each chunk contains exactly one 1, two 2's, three 3's, ..., and nine 9's. See Comments for more detailed definition.at n=47A245628
- Semiprimes with strictly increasing product of digits.at n=47A246569