286
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 504
- Proper Divisor Sum (Aliquot Sum)
- 218
- 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
- 120
- Möbius Function
- -1
- Radical
- 286
- 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
- yes
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 104
- Smith 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
Names
- German
- zweihundertsechsundachtzig· ordinal: zweihundertsechsundachtzigste
- English
- two hundred eighty-six· ordinal: two hundred eighty-sixth
- Spanish
- doscientos ochenta y seis· ordinal: 286º
- French
- deux cent quatre-vingt-six· ordinal: deux cent quatre-vingt-sixième
- Italian
- duecentoottantasei· ordinal: 286º
- Latin
- ducenti octoginta sex· ordinal: 286.
- Portuguese
- duzentos e oitenta e seis· ordinal: 286º
Appears in sequences
- Number of positive integers <= 2^n of form x^2 + 16*y^2.at n=11A000018
- Number of unlabeled rooted trees with n nodes (or connected functions with a fixed point).at n=9A000081
- Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6.at n=11A000292
- a(n) = 1^2 + 3^2 + 5^2 + 7^2 + ... + (2*n-1)^2 = n*(4*n^2 - 1)/3.at n=6A000447
- Heptagonal numbers (or 7-gonal numbers): n*(5*n-3)/2.at n=11A000566
- Number of twin prime pairs < square of n-th prime.at n=30A000885
- Genus of complete graph on n nodes.at n=61A000933
- Dimensions (sorted, with duplicates removed) of real simple Lie algebras.at n=58A001066
- a(n) = binomial coefficient C(n,10).at n=3A001287
- Nearest integer to 2*n*log(n).at n=39A001618
- v-pile positions of the 4-Wythoff game with i=3.at n=54A001968
- Numbers dividing A002037(i) and larger than A002037(i-1), for some i>0.at n=25A002038
- a(n) = least value of m for which Liouville's function A002819(m) = -n.at n=20A002053
- Numbers k for which the rank of the elliptic curve y^2 = x^3 - k is 2.at n=36A002154
- Numerators of convergents to cube root of 2.at n=6A002352
- Numbers k such that (k^2 + k + 1)/3 is prime.at n=41A002640
- a(n) = Sum_{d|n, d <= 3} d^2 + 3*Sum_{d|n, d>3} d.at n=68A002660
- Numbers k such that (4*k^2 + 1)/5 is prime.at n=46A002732
- Number of integer points in a certain quadrilateral scaled by a factor of n.at n=24A002789
- Numbers k such that 4*k^2 + 9 is prime.at n=53A002970