6904
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 12960
- Proper Divisor Sum (Aliquot Sum)
- 6056
- 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
- 3448
- Möbius Function
- 0
- Radical
- 1726
- Omega Function (Ω)
- 4
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 44
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- 4th powers written backwards.at n=7A002108
- 6th powers written backwards.at n=4A002138
- Powers of 2 written backwards.at n=12A004094
- Cubes written backwards.at n=15A004165
- Numbers k such that phi(k + 12) | sigma(k) for k not congruent to 0 (mod 3).at n=26A015850
- Numbers k such that the continued fraction for sqrt(k) has period 72.at n=22A020411
- Numbers that are the sum of 3 distinct positive cubes in exactly 2 ways.at n=41A025400
- Powers of 2 written backwards and sorted.at n=12A034906
- a(n) = T(n,n), array T given by A047858.at n=9A036542
- a(n) = (9*n^2 + 3*n + 2)/2.at n=39A038764
- Number of primes between n*100000 and (n+1)*100000.at n=19A038825
- Theta series of D8 lattice with respect to midpoint of edge.at n=9A045820
- First differences are A005563.at n=26A047732
- Numbers k such that sigma(k-2) + sigma(k+2) = sigma(2k).at n=6A067172
- Numbers n such that phi(reverse(n)) = phi(reverse(n-1)) + phi(reverse(n-2)).at n=18A069969
- Powers of 4 written backwards.at n=6A071582
- Powers of 8 written backwards.at n=4A071586
- Numbers k such that the k-th semiprime == 11 (mod k).at n=11A106136
- Powers of 4 written backwards and sorted.at n=6A134110
- Powers of 8 written backwards and sorted.at n=4A134114