1844
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3234
- Proper Divisor Sum (Aliquot Sum)
- 1390
- 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
- 920
- Möbius Function
- 0
- Radical
- 922
- Omega Function (Ω)
- 3
- 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
- 37
- 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
- Prime numbers of measurement.at n=40A002049
- Numbers that are the sum of 10 positive 6th powers.at n=27A003366
- a(n) = floor(n*phi^10), where phi is the golden ratio, A001622.at n=15A004925
- Unique period lengths of primes mentioned in A007615.at n=41A007498
- Coordination sequence T1 for Zeolite Code NON.at n=26A008212
- If a, b in sequence, so is ab+4.at n=34A009303
- Numbers k giving rise to prime quadruples (30k+11, 30k+13, 30k+17, 30k+19).at n=25A014561
- Seven iterations of Reverse and Add are needed to reach a palindrome.at n=23A015986
- Numbers k such that the continued fraction for sqrt(k) has period 30.at n=19A020369
- a(n) = 3^n - n^3.at n=7A024026
- a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers).at n=10A024469
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A014306, t = (primes).at n=38A024696
- a(n) = Sum_{k=0..n-1} T(n,k)*T(n,2n-k), T given by A027960.at n=5A027980
- a(n) = n^2 - 5.at n=43A028875
- 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 20.at n=42A031518
- Numbers in which all pairs of consecutive base-9 digits differ by 2.at n=51A033087
- Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,3.at n=4A037606
- Numerators of continued fraction convergents to sqrt(297).at n=6A041558
- a(n)=(s(n)+2)/7, where s(n)=n-th base 7 palindrome that starts with 5.at n=34A043063
- Numbers k such that string 4,3 occurs in the base 7 representation of k but not of k-1.at n=42A044169