1682
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
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2613
- Proper Divisor Sum (Aliquot Sum)
- 931
- 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
- 812
- Möbius Function
- 0
- Radical
- 58
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 42
- 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
- Conjecturally largest even integer which is an unordered sum of two primes in exactly n ways.at n=24A000954
- a(n) = 2*n^2.at n=29A001105
- a(n) = sigma_2(n): sum of squares of divisors of n.at n=40A001157
- Number of quasi-alternating permutations of length n.at n=5A001758
- a(n) = Sum_{d|n, d == 1 mod 4} d^2 - Sum_{d|n, d == 3 mod 4} d^2.at n=40A002173
- a(n) = n^2 + 1.at n=41A002522
- Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1.at n=9A006145
- Coordination sequence T1 for Zeolite Code BRE.at n=27A008058
- Coordination sequence T1 for Zeolite Code HEU.at n=27A008116
- Coordination sequence T1 for Zeolite Code MER.at n=30A008160
- Coordination sequence T2 for Zeolite Code THO.at n=29A008239
- Coordination sequence T3 for Zeolite Code THO.at n=29A008240
- Expansion of Jacobi theta constant theta_2^6 /(64q^(3/2)).at n=30A008440
- Coordination sequence T1 for Zeolite Code -ROG.at n=31A009859
- Coordination sequence T2 for Zeolite Code CON.at n=29A009869
- a(n) is the smallest integer k such that phi(k) + n | sigma(k + n).at n=59A015791
- a(1) = 1; a(n+1) = floor((sum{k=1 to n} a(k)^3)^(1/3)).at n=40A016085
- Numerator of sum of -2nd powers of divisors of n.at n=40A017667
- Duplicate of A024537.at n=8A018905
- Coordination sequence T3 for Zeolite Code SAO.at n=32A019573