7885
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 10080
- Proper Divisor Sum (Aliquot Sum)
- 2195
- 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
- 5904
- Möbius Function
- -1
- Radical
- 7885
- 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
- 26
- 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
- Number of rooted toroidal maps with 2 vertices and n faces and no isthmuses.at n=3A006425
- Powers of fifth root of 14 rounded down.at n=17A018153
- Pseudoprimes to base 84.at n=23A020212
- Lucky numbers that are decimal concatenations of n with n + 7.at n=9A032657
- Number of 3 X 3 stochastic matrices under row and column permutations.at n=37A052282
- a(n) = 6*n^2 + 3*n + 1.at n=36A085473
- Number of partitions of n into decimal repdigit numbers.at n=35A088669
- a(n) = n^3 + 6*n^2 + 6*n + 1.at n=18A090197
- Number of partitions of n into decimal palindromes.at n=35A091580
- a(n) = (27*n^2 + 9*n + 2)/2.at n=24A093485
- a(n) = round(10000*log(n/10)).at n=21A104077
- a(0)=a(1)=a(2)=a(3)=a(4)=a(5)=1; a(n)=a(n-1)+a(n-2)-a(n-4)+a(n-6) for n>=6.at n=26A109537
- Composite numbers k that divide 3^k - 2^k - 1, excluding powers of 2, 3 and 7.at n=22A127073
- a(n) = n*(2*n^2 + 5*n + 13)/2.at n=19A163655
- Expansion of (5-19*x)/(1-10*x+23*x^2).at n=4A164038
- The function W_n(8) (see Borwein et al. reference for definition).at n=4A169712
- The function W_5(2n) (see Borwein et al. reference for definition).at n=4A169714
- Numbers n with property that 42*n+37 is in A175284.at n=10A175285
- Odd composite numbers m for which 12*|A000367((m+1)/2)|==(-1)^{(m-1)/ 2}* A002445((m+1)/2) (mod m).at n=40A180943
- Odd numbers producing 6 odd numbers in the Collatz iteration.at n=44A198589