1843
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1960
- Proper Divisor Sum (Aliquot Sum)
- 117
- 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
- 1728
- Möbius Function
- 1
- Radical
- 1843
- 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
- 130
- 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
- Let A(n) = #{(i,j): i^2 + j^2 <= n}, V(n) = Pi*n, P(n) = A(n) - V(n); sequence gives values of n where |P(n)| sets a new record.at n=23A000099
- Number of ways to represent n using the binary operator a * b = 2^a + b.at n=13A000630
- Numbers that are the sum of 9 positive 6th powers.at n=25A003365
- Year of birth of n-th President of U.S.A.at n=24A008745
- Pseudoprimes to base 96.at n=13A020224
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=40A020361
- (d(n)-r(n))/5, where d = A026066 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=26A026068
- Distinct odd elements in the 5-Pascal triangle A028313.at n=46A028319
- a(n) = (n+3)^2 - 6.at n=40A028878
- 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 41.at n=16A031539
- Numbers with the property that all pairs of consecutive base-4 digits differ by more than 1.at n=46A032967
- Number of partitions of n into parts not of the form 13k, 13k+5 or 13k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 5 are greater than 1.at n=27A035953
- Numbers k such that 5*k + 1 is a square.at n=38A036666
- Numbers k such that phi(k) is a perfect cube.at n=46A039771
- Numbers k such that 3 and 4 occur juxtaposed in the base-10 representation of k but not of k-1.at n=37A043240
- Numbers k such that 3 and 4 occur juxtaposed in the base-10 representation of k but not of k+1.at n=37A044020
- Numbers k such that string 1,1 occurs in the base 6 representation of k but not of k-1.at n=46A044109
- Numbers k such that string 6,3 occurs in the base 8 representation of k but not of k-1.at n=31A044238
- Numbers n such that string 6,7 occurs in the base 9 representation of n but not of n-1.at n=24A044312
- Numbers n such that string 4,3 occurs in the base 10 representation of n but not of n-1.at n=20A044375