13843
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14080
- Proper Divisor Sum (Aliquot Sum)
- 237
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13608
- Möbius Function
- 1
- Radical
- 13843
- 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
- 76
- 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 ferrites M_{10}Y_n that repeat after 6n+50 layers.at n=13A011964
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 29 ones.at n=2A031797
- "DHK" (bracelet, identity, unlabeled) transform of 3,3,3,3,...at n=9A032253
- Largest squarefree number k such that Q(sqrt(-k)) has class number n.at n=9A038552
- When expressed in base 3 and then interpreted in base 5, is a multiple of the original number.at n=16A062864
- a(n) = prime(n)*prime(n+2).at n=28A090076
- Greatest number, not divisible by 4, having exactly n partitions into three squares.at n=4A095811
- Greatest number, not divisible by 4, having exactly n partitions into three positive squares.at n=4A095812
- Area of consecutive Prime-Indexed Prime rectangles.at n=9A119658
- Row sums of triangle A137629.at n=29A137630
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (0, 0, 1), (1, -1, 1), (1, 0, -1)}.at n=11A148029
- Product of the two primes with indices equal to the members of the n-th twin prime pair.at n=4A161763
- Number of slanted n X 4 (i=1..n) X (j=i..4+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 2 neighbors with the same value.at n=37A165378
- Partial sums of A006567.at n=32A172463
- a(n) = prime(n) times the n-th nonnegative noncomposite.at n=30A176098
- Partial sums of A050508.at n=29A178129
- S_9 sequence in partition of integers > 1 described in A240521.at n=34A240536
- Number of length 5 1..(n+2) arrays with no leading partial sum equal to a prime.at n=7A254543
- Quasi-Carmichael numbers to exactly two bases.at n=27A257752
- Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly two bit positions.at n=41A261074