3976
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
- 16
- Divisor Sum
- 8640
- Proper Divisor Sum (Aliquot Sum)
- 4664
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1680
- Möbius Function
- 0
- Radical
- 994
- Omega Function (Ω)
- 5
- Little Omega Function (ω)
- 3
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
- 25
- 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
- Number of mixed Husimi trees with n nodes; or rooted polygonal cacti with bridges.at n=9A000237
- Number of loopless rooted planar maps with 3 faces and n vertices and no isthmuses. Also a(n)=T(4,n-3), array T as in A049600.at n=25A006416
- Coordination sequence T3 for Zeolite Code DOH.at n=39A008080
- Expansion of log(1+x)*cos(tan(x)).at n=8A009408
- Expansion of e.g.f: log(1+x)/cosh(tanh(x)).at n=8A009434
- Coordination sequence T2 for Zeolite Code VSV.at n=40A009915
- Numbers k giving rise to prime quadruples (30k+11, 30k+13, 30k+17, 30k+19).at n=40A014561
- Pseudoprimes to base 25.at n=39A020153
- Pseudoprimes to base 57.at n=32A020185
- a(n) = n*(31*n + 1)/2.at n=16A022289
- a(n) = T(2*n, n-2), where T is given by A026519.at n=6A026527
- Duplicate of A026527.at n=6A026544
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 18.at n=6A031696
- Number of reversible strings with n-1 beads of 2 colors. 6 beads are black. Strings are not palindromic.at n=9A032093
- Numerators of continued fraction convergents to sqrt(595).at n=7A042140
- Indices of triangular numbers which are also pentagonal.at n=4A046175
- a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i) where T is A049627.at n=42A049630
- Numbers whose 4th power is the sum of two positive cubes in a nontrivial way.at n=44A051387
- Numbers k such that k^12 == 1 (mod 13^3).at n=21A056086
- Triangle: Number of asymmetric semigroups of order n with k idempotents.at n=17A058113