12785
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15348
- Proper Divisor Sum (Aliquot Sum)
- 2563
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10224
- Möbius Function
- 1
- Radical
- 12785
- 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
- 125
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 35.at n=27A020374
- Number of partitions of n into parts not of the form 23k, 23k+7 or 23k-7. Also number of partitions with at most 6 parts of size 1 and differences between parts at distance 10 are greater than 1.at n=35A035995
- a(n) = 104*n + 9977.at n=27A126978
- Number of (n+1) X 3 0..4 arrays with every 2 X 2 subblock summing to 8.at n=3A183645
- Number of (n+1) X 5 0..4 arrays with every 2 X 2 subblock summing to 8.at n=1A183647
- T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock summing to 8.at n=11A183652
- T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock summing to 8.at n=13A183652
- Number of rooted twice-partitions of n where the composite rooted partition is strict.at n=27A301750
- Squared length of diagonal of right trapezoid with three consecutive prime length sides.at n=29A360790