4394
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 7140
- Proper Divisor Sum (Aliquot Sum)
- 2746
- 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
- 2028
- Möbius Function
- 0
- Radical
- 26
- Omega Function (Ω)
- 4
- 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
- 95
- 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
- yes
- Odd
- no
Appears in sequences
- G.f.: 2*(1-x^3)/((1-x)^5*(1+x)^2).at n=24A005996
- Number of self-complementary 2-colored bracelets (turnover necklaces) with 2n beads.at n=13A007148
- Number of strict first-order maximal independent sets in path graph.at n=29A007383
- Coordination sequence T1 for Zeolite Code LOS.at n=46A008132
- Numbers k such that k | 5^k + 1.at n=29A015951
- Nine iterations of Reverse and Add are needed to reach a palindrome.at n=23A015990
- Powers of fifth root of 20 rounded down.at n=14A018171
- Powers of fifth root of 20 rounded to nearest integer.at n=14A018172
- Numbers k such that the continued fraction for sqrt(k) has period 23.at n=15A020362
- Nonsquarefree k such that Pell equation x^2 - k*y^2 = -1 is soluble.at n=36A031397
- a(n) = 2*n^3.at n=13A033431
- Conjecturally, a power of 2 written in base 3 cannot have this many 0's.at n=38A036462
- Number of partitions satisfying (cn(0,5) <= cn(2,5) = cn(3,5) and cn(0,5) <= cn(1,5) and cn(0,5) <= cn(4,5)).at n=42A036807
- Coordination sequence T2 for Zeolite Code ESV.at n=44A038410
- Coordination sequence T5 for Zeolite Code ESV.at n=44A038414
- Numbers k that divide 10^k + 2^k.at n=43A045583
- Numbers k that divide 6^k + 4^k.at n=29A045591
- Numbers k that divide 9^k + 7^k.at n=13A045605
- Truncated square pyramid numbers: a(n) = Sum_{k = n..2*n} k^2.at n=12A050409
- Numbers k such that k | 12^k + 11^k + 10^k + 9^k + 8^k + 7^k + 6^k + 5^k + 4^k + 3^k + 2^k + 1^k.at n=43A057291