8066
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
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 12540
- Proper Divisor Sum (Aliquot Sum)
- 4474
- 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
- 3888
- Möbius Function
- -1
- Radical
- 8066
- 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
- 70
- 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
- Number of points on surface of truncated tetrahedron: a(n) = 14*n^2 + 2 for n > 0, a(0)=1.at n=24A005905
- Numbers k such that the continued fraction for sqrt(k) has period 19.at n=42A020358
- Numbers whose base-6 representation has exactly 6 runs.at n=26A043614
- Numbers n such that 105*2^n-1 is prime.at n=29A050578
- Smallest multiple of n-th prime with all even digits.at n=28A062281
- G.f.: Product((1+x^i)/(1-x^i),i=1..n-1)/(1-x^n), with n = 8.at n=22A091779
- Numbers n such that n^3 is zeroless pandigital.at n=36A124628
- Numbers k such that k and k^2 use only the digits 0, 3, 5, 6 and 8.at n=5A136938
- Twice octagonal numbers: 2*n*(3*n-2).at n=37A139267
- Starts with 2; has two properties: concatenation of its digits is same string as concatenation of digits of its first differences and sequence and first differences have no term in common. When there is a choice in choosing the next term in the first differences, choose the smallest number not yet present in either the sequence or its first differences.at n=42A139334
- Numerators of approximants of a continued fraction for 4/Pi - 1 = (4 - Pi)/Pi.at n=5A142969
- Numbers n with property that A077116(n) is nonzero square.at n=38A154101
- Number of n-bead necklaces labeled with numbers 1..5 allowing reversal, with no adjacent beads differing by more than 1.at n=11A208718
- Number of bitstrings of length n which (if having two or more runs) the last two runs have different lengths.at n=12A208900
- Number of (weakly) superprimitive binary sequences of length n.at n=13A216215
- Last time n appears in the first differences of n*log(n): A217865.at n=8A217866
- Numbers n such that A234519(n) = n.at n=40A234524
- Number of triples (a,b,c) with 0 < a < b < c < p and a + b + c == 0 mod p, where p = prime(n).at n=47A242089
- Numbers k such that k, k+1, k+2, and k+3 are not divisible by any of their nonzero digits.at n=43A244358
- Numbers n such that n, n+1, n+2, n+3, and n+4 are not divisible by any of their nonzero digits.at n=3A244359