3869
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3996
- Proper Divisor Sum (Aliquot Sum)
- 127
- 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
- 3744
- Möbius Function
- 1
- Radical
- 3869
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 144
- 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 T3 for Zeolite Code AEL.at n=41A008006
- Coordination sequence T1 for Zeolite Code MAZ.at n=43A008144
- Coordination sequence T1 for Zeolite Code RTH.at n=43A009893
- Numbers k such that the continued fraction for sqrt(k) has period 9.at n=24A010339
- Numbers having period-4 6-digitized sequences.at n=11A031197
- Number of partitions of n into parts not of the form 15k, 15k+4 or 15k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 6 are greater than 1.at n=31A035958
- Numerators of continued fraction convergents to sqrt(378).at n=6A041716
- a(n)=T(n,2), array T as in A049735.at n=35A049745
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 5.at n=10A051970
- Number of partitions of n into at most 1 copy of 1, 2 copies of 2, 3 copies of 3, ... .at n=37A052335
- Numbers k such that k^10 == 1 (mod 11^3).at n=28A056085
- Geometric mean of the digits = 6. In other words, the product of the digits is = 6^k where k is the number of digits.at n=22A061429
- Index of the smallest prime which follows square of n-th prime.at n=42A062773
- n-th positive integer whose digits sum up to n.at n=25A081927
- Number of different values that can be assumed by the determinant of a 3 X 3 matrix whose elements are all permutations of the consecutive integers in the range (n-4,n+4).at n=40A097400
- Decimal part of 1/a(n) starts with Fibonacci(n) (leading zeros excluded).at n=17A099405
- a(n) = 8*n^2 - 3.at n=21A108928
- Brilliant numbers (A078972) which are the sum of distinct double factorials (A006882).at n=34A115652
- Number of n-digit prime quadruplets.at n=6A120120
- Triangle read by rows: T(n,k) is the number of ordered trees with n edges and jump-length equal to k (n >= 0, 0 <= k <= n-2).at n=42A127529