12682
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 20196
- Proper Divisor Sum (Aliquot Sum)
- 7514
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5952
- Möbius Function
- -1
- Radical
- 12682
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 81
- 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
- Decimal part of a(n)^(1/3) starts with reversal of its integer part: first term of runs.at n=21A034309
- Number of partitions of n into parts not of forms 4*k+2, 20*k, 10*k+5.at n=53A036026
- a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i), array T as in A049747.at n=42A049750
- List of codewords in binary lexicode with Hamming distance 6 written as decimal numbers.at n=18A075934
- Shadow of Euler's constant exp(1).at n=30A108912
- Expansion of q^(-3/4) * eta(q^2)^2 * eta(q^20) / (eta(q)^2 * eta(q^4)) in powers of q.at n=26A146163
- Number of binary strings of length n with no substrings equal to 0001, 1010, or 1100.at n=22A164487
- Potential magic constants of 8 X 8 magic squares composed of consecutive primes.at n=31A189188
- Numbers n such that n^2 + 1 is divisible by a 4th power.at n=41A218563
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 150", based on the 5-celled von Neumann neighborhood.at n=35A270323
- a(n) = A273059(4n).at n=20A275916
- 5-untouchable numbers.at n=29A284187
- Expansion of Product_{k>=1} ((1 + x^(4*k)) / (1 - x^k)).at n=31A285472
- Sum of the next n positive integers repeated (A008619).at n=36A319006
- a(n) = A007678(2*n)/(2*n).at n=34A341734
- Number of integer partitions of n whose mean is not an integer.at n=36A349156
- Number of compositions into sums of fourth powers.at n=80A363748