3778
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5670
- Proper Divisor Sum (Aliquot Sum)
- 1892
- 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
- 1888
- Möbius Function
- 1
- Radical
- 3778
- 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
- 82
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence T5 for Zeolite Code MFI.at n=39A008168
- Coordination sequence T3 for Zeolite Code STI.at n=42A008236
- Number of positive integers that are not the sum of distinct n-th-order polygonal numbers.at n=31A025524
- 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 60.at n=16A031558
- Numbers k such that k! is divisible by the square of (f+d)!^2 for d = 0, 1 and 2 (and possibly larger d), where f = floor(k/2).at n=12A056068
- Values of k for which A065358(k) is 0.at n=36A064940
- Number of log-concave compositions (ordered partitions) of n.at n=34A069916
- a(n) = 3^n + 6^n + 7^n.at n=4A074555
- Solve 2^n - 2 = 7(x^2 - x) + (y^2 - y) for (x,y) with x>0, y>0; a(n) = value of y.at n=26A076631
- Sum(j=1,n,floor(A000041(j)/j)).at n=36A086736
- Total number of parts equal to 1 in all plane partitions of n.at n=11A090539
- Triangle read by rows: T(n,k) = count of parts k in all plane partitions of n.at n=55A092288
- Sums of 10 distinct positive pentatope numbers (A000332).at n=41A104400
- a(n+3) = 2a(n+2) - 3a(n+1) + 2a(n); a(0) = 1, a(1) = -1, a(2) = -2.at n=26A105225
- Numbers n such that sum of n-th and (n+1)-st semiprimes is a square=q^2.at n=28A109311
- Jumping divisor sequence (see Comments lines for definition).at n=56A168007
- Number of compositions of n such that the smallest part is divisible by the number of parts.at n=38A171628
- Semiprimes k such that k^2 - 7 and k^2 + 7 are also semiprime.at n=40A173087
- Number of permutations of the multiset {1,1,2,2,3,3,...,n+1,n+1} avoiding the permutation patterns {132, 231, 2134}.at n=41A181510
- Numbers k such that k^2 has one more divisor than k^2 - 1.at n=41A188629