3861
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 6720
- Proper Divisor Sum (Aliquot Sum)
- 2859
- 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
- 2160
- Möbius Function
- 0
- Radical
- 429
- Omega Function (Ω)
- 5
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 25
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- 4-dimensional figurate numbers: a(n) = (5*n-1)*binomial(n+2,3)/4.at n=11A002418
- Number of nodes in regular n-gon with all diagonals drawn.at n=19A007569
- Coordination sequence T2 for Zeolite Code PHI.at n=45A008228
- Coordination sequence T1 for Zeolite Code AHT.at n=42A009866
- Pseudoprimes to base 53.at n=38A020181
- a(n) = Sum_{d|n} sigma(n/d)*d^3.at n=13A027847
- Divisors of 999999.at n=43A027892
- Numbers each of whose runs of digits in base 12 has length 2.at n=30A033010
- Composites n such that A001414(n) is odd and divides n.at n=33A036346
- Convolution of A007054 (super ballot numbers) with A000984 (central binomial coefficients).at n=6A038665
- Positive integers having more base-12 runs of even length than odd.at n=32A044838
- Distinct numbers in writing first numerator and then denominator of 1/2-Pascal triangle (by row).at n=46A046220
- First numerator and then denominator of elements to right of central elements of 1/2-Pascal triangle (by row), excluding 1's.at n=66A046227
- First numerator and then denominator of elements to right of central elements of 1/2-Pascal triangle (by row), excluding 1's and 2's.at n=44A046228
- First numerator and then denominator of elements to right of central elements of 1/2-Pascal triangle (by row), excluding 1's and 2's.at n=42A046228
- Odd numbers divisible by exactly 5 primes (counted with multiplicity).at n=39A046318
- Odd composite numbers divisible by the sum of their prime factors (counted with multiplicity).at n=14A046347
- Composite numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=11A046358
- Odd numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=2A046359
- Numerators of elements to right of central elements of 1/2-Pascal triangle (by row).at n=56A046531