7327
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7776
- Proper Divisor Sum (Aliquot Sum)
- 449
- 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
- 6880
- Möbius Function
- 1
- Radical
- 7327
- 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
- 101
- 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
- Number of unrooted triangulations of a disk that have reflection symmetry with n interior nodes and 3 nodes on the boundary.at n=10A002712
- Coordination sequence for MgNi2, Position Mg1.at n=21A009936
- Expansion of 1/(1-x^4-x^5-x^6).at n=47A017828
- Numbers whose sum of divisors is a fifth power.at n=21A019423
- 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 85.at n=8A031583
- Sort then Add, a(1)=29.at n=11A033904
- Integers whose sum of divisors is 6^5 = 7776.at n=16A048255
- 15-gonal (or pentadecagonal) numbers: n*(13n-11)/2.at n=34A051867
- a(0) = 1; for n >= 1, a(n) = Sum_{j=0..a(n-1) mod n} a(j).at n=51A057176
- Number of distinct Cunningham chains of first kind whose initial prime (cf. A059453) <= 2^n.at n=19A059690
- a(n) = (11*n^2 - 11*n + 2)/2.at n=36A069125
- Expansion of (1 + 3x - 2x^2 - 12x^3)/(1 - 9x^2 + 20x^4).at n=10A097111
- Sums of p-th to the q-th prime where p and q are consecutive primes.at n=39A114381
- Start with 1015 and repeatedly reverse the digits and add 4 to get the next term.at n=57A117807
- Start with 1027 and repeatedly reverse the digits and add 16 to get the next term.at n=81A119455
- a(n) = least k such that the remainder when 7^k is divided by k is n.at n=38A119715
- Start with 1013 and repeatedly reverse the digits and add 2 to get the next term.at n=25A120214
- Semiprimes which are the sum of two pentagonal numbers (A000326) in exactly two different ways.at n=39A120536
- Counts compositions as described by table A047969; however, only those ending with an odd part are considered.at n=49A123685
- Difference between squares of legs of primitive Pythagorean triangles, sorted (with multiplicity).at n=23A127923