9889
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 34
- Digital Root
- 7
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 11520
- Proper Divisor Sum (Aliquot Sum)
- 1631
- 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
- 8400
- Möbius Function
- -1
- Radical
- 9889
- Omega Function (Ω)
- 3
- 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
- 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
- 122
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Left diagonal of partition triangle A047812.at n=15A007044
- Numbers k such that the continued fraction for sqrt(k) has period 74.at n=34A020413
- Palindromic Fibonacci-lucky numbers.at n=43A039674
- Denominators of continued fraction convergents to sqrt(854).at n=6A042649
- Palindromes that start with 9.at n=20A043044
- Largest palindromic substring in 7^n.at n=19A046265
- Composite palindromes whose sum of prime factors is prime (counted with multiplicity).at n=35A046365
- Palindromes with exactly 3 distinct prime factors.at n=41A046393
- Engel expansion of 1/log(2) = 1.4427...at n=14A059183
- n sets a new record for the number of integers k such that n = k + reverse(k).at n=30A067035
- a(n) = 11*n^2 + 22*n.at n=28A067705
- Largest palindrome using minimum number of digits with a digit sum = n.at n=34A070244
- Palindromic odd composite numbers that are the products of an odd number of distinct primes.at n=23A075808
- Palindromic odd numbers with exactly 3 prime factors (counted with multiplicity).at n=33A075814
- Palindromic odd composite numbers with an odd number of prime factors (counted with multiplicity).at n=36A075815
- a(n) = n*(n+2)*(n-2)/3.at n=29A077415
- a(n) = index of the first occurrence of n in A088606.at n=33A088757
- Least area/6 of primitive Pythagorean triangles with even leg 4n.at n=30A096898
- Numbers of the concatenated form 9nn9.at n=8A102484
- A weighted tribonacci sequence, (1,3,9).at n=9A103770