3859
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4104
- Proper Divisor Sum (Aliquot Sum)
- 245
- 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
- 3616
- Möbius Function
- 1
- Radical
- 3859
- 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
- 56
- 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
- Coordination sequence T5 for Zeolite Code BOG.at n=44A008053
- Coordination sequence T1 for Banalsite.at n=37A008249
- Fibonacci sequence beginning 2 9.at n=14A022114
- Coordination sequence T7 for Zeolite Code MWW.at n=41A024992
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 61.at n=11A031559
- Numbers whose base-5 representation contains exactly three 1's and two 4's.at n=17A045261
- Numbers k such that 199*2^k-1 is prime.at n=34A050851
- Integers n such that the number of digits in n! is a cube.at n=14A056851
- Coordination sequence T1 for Zeolite Code MTF.at n=37A057304
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 79 ).at n=15A063352
- Semiprimes p1*p2 such that p2 mod p1 = 6, with p2 > p1.at n=40A064904
- Numbers that in base 2 need twelve 'Reverse and Add' steps to reach a palindrome.at n=25A066133
- Number of polyhexes with n cells that tile the plane by translation but not by 180-degree rotation (Conway criterion).at n=13A075208
- a(n) = Sum_{i=n+1..2n} prime(i) - Sum_{i=1..n} prime(i).at n=27A077354
- Main diagonal of square array A082025.at n=33A082189
- Least number beginning with n such that every concatenation is a prime.at n=37A090506
- a(n) = Sum_{k=0..floor(n/4)} C(n-2*k,2*k)*2^k.at n=16A098575
- Number of different ways angles from Pi/n to (n-1)Pi/n can tile around a vertex, where rotations of an angle sequence are not counted, but reflections that are different are counted.at n=6A098913
- Pythagorean years: a Pythagorean year is one whose digits partition into two disjoint sets such that, considering digital sums, the Pythagorean relation 5^2=4^2 + 3^2 is evinced.at n=38A101039
- Number of partitions of n into Fibonacci parts if each part is of two kinds.at n=18A103577