985
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1188
- Proper Divisor Sum (Aliquot Sum)
- 203
- 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
- 784
- Möbius Function
- 1
- Radical
- 985
- 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
- yes
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 23
- Smith Number
- yes
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
- no
- Odd
- yes
Names
- German
- neunhundertfünfundachtzig· ordinal: neunhundertfünfundachtzigste
- English
- nine hundred eighty-five· ordinal: nine hundred eighty-fifth
- Spanish
- novecientos ochenta y cinco· ordinal: 985º
- French
- neuf cent quatre-vingt-cinq· ordinal: neuf cent quatre-vingt-cinqième
- Italian
- novecentoottantacinque· ordinal: 985º
- Latin
- nongenti octoginta quinque· ordinal: 985.
- Portuguese
- novecentos e oitenta e cinco· ordinal: 985º
Appears in sequences
- Pell numbers: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2*a(n-1) + a(n-2).at n=9A000129
- Numbers m such that Fibonacci(m) ends with m.at n=32A000350
- a(0) = a(1) = 1; for n > 1, a(n) = n*a(n-1) + (-1)^n.at n=6A001120
- Numbers k such that 2*k^2 - 1 is a square.at n=4A001653
- Primes multiplied by 5.at n=44A001750
- a(n) = Fibonacci(n+3) - 2.at n=13A001911
- a(n) = floor(3^n / 2^n).at n=17A002379
- Markoff (or Markov) numbers: union of positive integers x, y, z satisfying x^2 + y^2 + z^2 = 3*x*y*z.at n=12A002559
- Continued fraction expansion of Lehmer's constant.at n=6A002665
- Interleave denominators (A000129) and numerators (A001333) of convergents to sqrt(2).at n=18A002965
- Numbers that are the sum of 11 positive 5th powers.at n=42A003356
- Numbers that are the sum of 5 positive 6th powers.at n=10A003361
- Add 4, then reverse digits; start with 0.at n=37A003608
- Numbers that are the sum of at most 5 nonzero 6th powers.at n=35A004856
- Numbers that are the sum of at most 6 nonzero 6th powers.at n=46A004857
- Smith (or joke) numbers: composite numbers k such that sum of digits of k = sum of digits of prime factors of k (counted with multiplicity).at n=48A006753
- Discriminants of totally real cubic fields.at n=25A006832
- Oscillates under partition transform.at n=30A007210
- Add 8, then reverse digits!.at n=32A007399
- Number of asymmetric rooted connected graphs where every block is a complete graph.at n=10A007561