8401
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8704
- Proper Divisor Sum (Aliquot Sum)
- 303
- 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
- 8100
- Möbius Function
- 1
- Radical
- 8401
- 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
- 65
- 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
- Restricted permutations.at n=12A000382
- Deceptive nonprimes: composite numbers k that divide the repunit R_{k-1}.at n=18A000864
- Number of ternary trees with n nodes.at n=4A002707
- a(n) = Sum_t t*F(n,t), where F(n,t) (see A095133) is the number of forests with n (unlabeled) nodes and exactly t trees.at n=12A005196
- Pseudoprimes to base 3.at n=21A005935
- Pseudoprimes to base 10.at n=29A005939
- Cyclotomic polynomials at x=3.at n=30A019321
- Pseudoprimes to base 9.at n=46A020138
- Pseudoprimes to base 19.at n=38A020147
- Pseudoprimes to base 28.at n=31A020156
- Pseudoprimes to base 29.at n=42A020157
- Pseudoprimes to base 30.at n=41A020158
- Pseudoprimes to base 57.at n=43A020185
- Pseudoprimes to base 84.at n=24A020212
- Pseudoprimes to base 87.at n=41A020215
- Pseudoprimes to base 90.at n=18A020218
- Pseudoprimes to base 100.at n=44A020228
- Strong pseudoprimes to base 3.at n=4A020229
- Strong pseudoprimes to base 9.at n=13A020235
- Strong pseudoprimes to base 10.at n=6A020236