7047
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 10920
- Proper Divisor Sum (Aliquot Sum)
- 3873
- 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
- 4536
- Möbius Function
- 0
- Radical
- 87
- Omega Function (Ω)
- 6
- 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
- 106
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = (8*n+1)*(8*n+7).at n=10A001533
- Numbers having three 0's in base 9.at n=29A043455
- Odd numbers divisible by exactly 6 primes (counted with multiplicity).at n=19A046319
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 2.at n=46A050061
- 22-gonal numbers: a(n) = n*(10*n-9).at n=27A051874
- Numbers n such that n | 12^n + 11^n + 10^n + 9^n.at n=42A057239
- Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n + 4^n.at n=24A057260
- Number of staircase polygons of area n with any number of (staircase polygon) holes on square lattice (not allowing rotations).at n=11A057417
- a(n) = A130179(n)/81.at n=13A130085
- Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-011 pattern in any orientation.at n=13A146252
- First trisection of A028560.at n=27A147651
- a(n) = a(n-1)^2 - a(n-2) for n > 2; a(1)=3, a(2)=0.at n=5A177785
- Monotonic ordering of nonnegative differences 6^i-3^j, for 40>= i>=0, j>=0.at n=20A192152
- a(1) = 1; for n>1, a(n) = floor(sqrt(a(n-1))) if that number is not already in the sequence, otherwise a(n) = 3*a(n-1).at n=40A213912
- G.f.: A(x) = 1 + x*B(x), where B(x) = 1 + x^2*C(x)^2, C(x) = 1 + x^3*D(x)^3, D(x) = 1 + x^4*E(x)^4, ...at n=33A228866
- a(n) = 3^n*A077985(n-1), A077985(-1) = 0. Irrational parts of the integers in Q(sqrt(2)) giving the length of a Lévy C-curve variant at iteration step n.at n=5A251733
- Smallest k such that A257743(k)=n.at n=13A257744
- Composites whose prime factorization in base 11 is an anagram of the number in base 11.at n=1A260054
- Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 78", based on the 5-celled von Neumann neighborhood.at n=13A278789
- Numbers k such that 6*10^k + 37 is prime.at n=21A281903