5294
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7944
- Proper Divisor Sum (Aliquot Sum)
- 2650
- 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
- 2646
- Möbius Function
- 1
- Radical
- 5294
- 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
- 54
- 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
- Number of points on surface of hexagonal prism: 12*n^2 + 2 for n > 0 (coordination sequence for W(2)).at n=21A005914
- Number of points on surface of square pyramid: 3*n^2 + 2 (n>0).at n=42A005918
- a(0) = 1, a(n) = 27*n^2 + 2 for n>0.at n=14A010017
- Numbers k such that the continued fraction for sqrt(k) has period 80.at n=15A020419
- Number of nonzero terms in expansion of square of Vandermonde determinant of order (n+1)x(n+1) in terms of Schur functions.at n=6A028333
- 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 72.at n=5A031570
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 34 ones.at n=31A031802
- Base-7 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,3,0.at n=4A037740
- Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.at n=1A048131
- Triangle read by rows: number of commutative monoids of order n with k idempotents.at n=43A058142
- a(n) = A000203(n)^2 - A001157(n) - 2n = sigma(n)^2 - sigma_2(n) - 2n.at n=49A066294
- Triangle read by rows, formed from product of Pascal's triangle (A007318) and Aitken's (or Bell's) triangle (A011971).at n=29A095674
- Positive integers n such that n^14 + 1 is semiprime (A001358).at n=27A104335
- Sum of three consecutive squares: a(n) = n^2 + (n + 1)^2 + (n + 2)^2.at n=42A120328
- Largest number k for which the n-th prime is the median of the largest prime dividing the first k integers.at n=30A126283
- a(n) = the number of "isolated divisors" of n!. A positive divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.at n=15A133952
- Numbers n such that 6^n+5 is prime.at n=19A145106
- Triangle read by rows: row n contains sequence S_n = [s(1), ..., s(n)] where s(1) is the least semiprime pq such that the recurrence s(i+1) = sum of two prime factors of s(i) generates a chain of exactly n semiprimes.at n=46A171095
- Triangle read by rows: row n contains sequence S_n = [s(1), ..., s(n)] where s(1) is the least semiprime pq such that the recurrence s(i+1) = sum of two prime factors of s(i) generates a chain of exactly n semiprimes.at n=36A171095
- a(n) = 4*n^2 + 3*n + 2.at n=36A185669