7622
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
- 8
- Divisor Sum
- 11856
- Proper Divisor Sum (Aliquot Sum)
- 4234
- 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
- 3672
- Möbius Function
- -1
- Radical
- 7622
- Omega Function (Ω)
- 3
- 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
- 39
- 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
- yes
- Odd
- no
Appears in sequences
- Arrays of dumbbells.at n=8A002941
- Denominators of continued fraction convergents to sqrt(124).at n=11A041225
- Numbers whose base-5 representation contains exactly three 2's and two 4's.at n=34A045291
- Total number of parts in all partitions of n into relatively prime parts.at n=21A085410
- Number of asymmetric rooted 2,3 cacti (triangular cacti with bridges).at n=11A091488
- Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and divisible by phi(k), that is A065395(k)/A000010(k) is a nonzero integer.at n=38A092587
- Number of isomorphism classes of smooth toric Fano n-folds (or, equivalently, regular Fano n-topes).at n=5A140296
- Partial sums of A106116.at n=38A173112
- Shifts left under XOR-convolution: a(n) = Sum_{k=0..n-1} a(k) XOR a(n-k-1) for n>1 with a(0)=1, a(1)=2.at n=9A192484
- Sum of odd quadratic residues of prime(n).at n=57A232505
- Fibonacci-like numbers with nonincreasing positive digits. Let a** denote the number that is obtained from a if its digits are written in nonincreasing order. Let a<+>b = (a + b)**. a(0)=0, a(1)=1, for n>=2, a(n) = a(n-1) <+> a(n-2).at n=13A237575
- Partial sums of A073602.at n=26A259035
- Expansion of Sum_{k>=0} x^k * Product_{j=1..k} (1 + j*x^j).at n=24A306730
- Triangle T(n,k) read by rows, giving even-numbered coefficients of the matching polynomial of the n-ladder graph.at n=57A308244
- Even numbers k such that A156552(k) is not a power of prime, and for which A323243(k) = sigma(A156552(k)) is congruent to 2 modulo 8.at n=24A332229
- Total number of optimal fundamentally different radio labelings summed over all simple (connected) graphs on n nodes.at n=6A340645
- a(n) = Sum_{k=1..n} k * rad(k).at n=30A350996
- Lexicographic earliest sequence of distinct positive integers having the same concatenation of digits as the sequence 2^a(n).at n=63A362202
- Number of unlabeled 2,3 cacti (triangular cacti with bridges) rooted at a triangle with n triangles and every node contained in exactly one triangle.at n=8A381469