4086
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
- 8892
- Proper Divisor Sum (Aliquot Sum)
- 4806
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1356
- Möbius Function
- 0
- Radical
- 1362
- Omega Function (Ω)
- 4
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 157
- 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
- yes
- Odd
- no
Appears in sequences
- "Magic" integers: a(n+1) is the smallest integer m such that there is no overlap between the sets {m, m-a(i), m+a(i): 1 <= i <= n} and {a(i), a(i)-a(j), a(i)+a(j): 1 <= j < i <= n}.at n=37A004210
- Expansion of a cusp form of weight 8 for Gamma_1(6).at n=17A006354
- Coordination sequence T5 for Zeolite Code HEU.at n=42A008120
- Coordination sequence T1 for Zeolite Code NAT.at n=43A008203
- Coordination sequence T3 for Zeolite Code -WEN.at n=46A009864
- Number of ordered 5-tuples of integers from [ 2,n ] with no common factors among quadruples.at n=12A015655
- Coordination sequence T5 for Zeolite Code TER.at n=43A016437
- a(n) = prime(n)*prime(n-1) - 1.at n=18A023515
- a(n) = [ 1/(2*t(n+1) - t(n) - t(n+2)) ], where t(n) = tan(Pi/2 - 1/n) satisfies n-1 < t(n) < n for all n >= 1.at n=12A024817
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (Lucas numbers), t = (primes).at n=15A025098
- 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 62.at n=18A031560
- Numerators of continued fraction convergents to sqrt(375).at n=7A041710
- a(n) = A048141(3*n+2).at n=44A051060
- Numbers k such that k | sigma_13(k) - phi(k)^13.at n=14A055707
- Numbers k such that k^16 == 1 (mod 17^3).at n=10A056088
- Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 9 sites wide.at n=42A058364
- McKay-Thompson series of class 15C for Monster.at n=13A058510
- a(n+1) = a(n)-th composite and a(1) = 13.at n=24A059408
- Pseudo-random numbers: a (very weak) pseudo-random number generator from the second edition of the C book.at n=9A061364
- Multiples of 9 having only even digits.at n=27A061831