9994
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 31
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 15840
- Proper Divisor Sum (Aliquot Sum)
- 5846
- 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
- 4716
- Möbius Function
- -1
- Radical
- 9994
- 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
- 179
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 70.at n=40A020409
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/11) starts with n.at n=31A034076
- Numbers having three 9's in base 10.at n=31A043527
- Numbers whose base-5 representation contains exactly two 3's and three 4's.at n=32A045303
- a(n) = a(n-1) + a(n - 1 minus the number of terms of a(k) == (mod 6) so far).at n=26A060733
- a(n) is the largest number which can be formed with no zeros, using least number of digits and having digit sum = n.at n=30A061219
- Non-balanced numbers in A015771.at n=18A078549
- Composite numbers between largest n-digit prime and the smallest (n+1) digit prime.at n=37A109936
- 3-almost primes with semiprime digits (digits 4, 6, 9 only).at n=28A111494
- Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 9.at n=5A116109
- Numbers k such that k concatenated with itself gives the product of two numbers which differ by 7.at n=6A116160
- Numbers k such that k * (k + 8) is the concatenation of two numbers m and m-7.at n=8A116244
- Numbers k such that k * (k + 7) is the concatenation of a number m with itself.at n=6A116291
- Numbers k such that if k = a*b, then a+b = reversal(k) for some integers a,b > 1.at n=13A161791
- Numbers that are the sum or product of two numbers, such that the sum and product have reversed digits.at n=11A166749
- Largest n-digit number that is divisible by exactly 3 primes (counted with multiplicity).at n=3A180927
- a(n) is the largest n-digit number with exactly 8 divisors, a(n) = 0 if no such number exists.at n=3A182676
- a(n) = the largest 4-digit number with exactly n divisors, a(n) = 0 if no such number exists.at n=7A182696
- Number of nX6 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=3A207958
- T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=39A207960