9449
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10320
- Proper Divisor Sum (Aliquot Sum)
- 871
- 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
- 8580
- Möbius Function
- 1
- Radical
- 9449
- 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
- 60
- 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
- Palindromes that start with 9.at n=16A043044
- Palindromes with exactly 2 prime factors (counted with multiplicity).at n=49A046328
- Palindromes with exactly 2 distinct prime factors.at n=46A046392
- Palindromic odd squarefree numbers with an even number of distinct prime factors.at n=40A075810
- Palindromic odd numbers with exactly 2 prime factors (counted with multiplicity).at n=38A075812
- Diagonal sums of triangle A055249.at n=10A079282
- Number of partitions of n such that the least part occurs exactly twice.at n=42A096373
- Recurrence sequence based on positions of digits in decimal places of Catalan's constant, G (often also called K).at n=7A098322
- Palindromic in bases 10 and 32.at n=21A099165
- Numbers of the concatenated form 9nn9.at n=4A102484
- Semiprimes with semiprime digits (digits 4, 6, 9 only).at n=28A107342
- Numbers whose outer two digits are 9's and inner digits are 4's.at n=1A108896
- Start with 34 and repeatedly reverse the digits and add 16 to get the next term.at n=40A119454
- Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that the set {p(i)-i, i=1,2,...,n} has exactly k elements (1<=k<=n).at n=32A125182
- Numbers k such that 2*k+1, 3*k+2 and 4*k+3 are primes.at n=39A126955
- Odd palindromes which are semiprimes with an even number of digits.at n=16A132288
- Odd composite numbers such that the sum of any two terms, plus 1, is composite.at n=37A133763
- Bisection of A138540.at n=6A136092
- Moment sequence of tr(A) in USp(6).at n=12A138540
- a(n) = 29 + 73*n + 37*n^2.at n=15A145980