13645
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 16380
- Proper Divisor Sum (Aliquot Sum)
- 2735
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10912
- Möbius Function
- 1
- Radical
- 13645
- 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
- 138
- 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
- Number of graphical basis partitions of 2n.at n=29A001130
- Number of n-celled polyplets having bilateral symmetry.at n=11A030234
- Number of rooted trees with n nodes and 4 leaves.at n=13A055279
- a(n) = sum of n successive primes after the n-th prime.at n=42A131740
- Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,1,2,0,1,0,2 for x=0,1,2,3,4,5,6.at n=4A197962
- Number of partitions of n in which any two parts differ by at most 6.at n=46A218508
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 241", based on the 5-celled von Neumann neighborhood.at n=25A270990
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 998", based on the 5-celled von Neumann neighborhood.at n=13A284546
- Sum of the smallest parts in the partitions of n into 6 parts.at n=52A308868
- a(n) is the sum of the digits of all positive integers k <= 2^n.at n=10A319733
- Number of partitions in all twice partitions of n where both partitions are strict.at n=20A327553
- Number of distinct intersections among all circles that can be constructed on vertices of an n-sided regular polygon, using only a compass.at n=17A331702
- Numbers whose squares have the first three digits the same as the next three digits.at n=34A353080
- First of 5 consecutive semiprimes congruent to 1,2,3,4,5 (mod 6).at n=8A367104