3255
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 6144
- Proper Divisor Sum (Aliquot Sum)
- 2889
- 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
- 1440
- Möbius Function
- 1
- Radical
- 3255
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 74
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Boustrophedon transform of 1,1,2,4,8,16,32,...at n=7A000734
- a(n) = sigma_2(n): sum of squares of divisors of n.at n=49A001157
- Numbers k such that phi(k) = phi(k+1).at n=13A001274
- Numbers k such that k^4 can be written as a sum of four positive 4th powers.at n=16A003294
- Orders of cyclotomic polynomials containing a coefficient the absolute value of which is >= 4.at n=13A013592
- a(n) = n*(29*n - 1)/2.at n=15A022286
- 7 times triangular numbers: 7*n*(n+1)/2.at n=30A024966
- 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 19.at n=20A031517
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 19.at n=2A031697
- Sums of distinct powers of 5.at n=42A033042
- Base-5 digits are, in order, the first n terms of the periodic sequence with initial period 1,0.at n=5A033115
- a(n) = LCM_{k=1..n} (2^k - 1).at n=4A034268
- Let f(n) = number of ways to factor n = A001055(n); a(n) = sum of f(k) over all terms k in A025487 that have n factors.at n=6A035310
- Odd numbers m such that there exists an even number k < m with phi(k) = phi(m).at n=31A036798
- Positive numbers having the same set of digits in base 2 and base 5.at n=38A037410
- Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 2,3,0.at n=4A037627
- Sums of 3 distinct powers of 5.at n=14A038475
- Triangle of D-analogs of Stirling numbers of the 2nd kind.at n=32A039760
- Triangle of D-analogs of Stirling numbers of the 2nd kind.at n=31A039761
- Numbers whose base-5 representation has exactly 6 runs.at n=0A043606