850
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 1674
- Proper Divisor Sum (Aliquot Sum)
- 824
- 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
- 320
- Möbius Function
- 0
- Radical
- 170
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 59
- Smith 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
Names
- German
- achthundertfünfzig· ordinal: achthundertfünfzigste
- English
- eight hundred fifty· ordinal: eight hundred fiftieth
- Spanish
- ochocientos cincuenta· ordinal: 850º
- French
- huit cent cinquante· ordinal: huit cent cinquantième
- Italian
- ottocentocinquanta· ordinal: 850º
- Latin
- octingenti quinquaginta· ordinal: 850.
- Portuguese
- oitocentos e cinquenta· ordinal: 850º
Appears in sequences
- Let A(n) = #{(i,j): i^2 + j^2 <= n}, V(n) = Pi*n, P(n) = A(n) - V(n); sequence gives values of n where |P(n)| sets a new record.at n=20A000099
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=6A000443
- Number of trees of diameter 7.at n=6A000550
- a(n) = sigma_2(n): sum of squares of divisors of n.at n=23A001157
- a(n) = sigma_2(n): sum of squares of divisors of n.at n=25A001157
- Triangular numbers plus quarter-squares: n*(n+1)/2 + floor((n+1)^2/4) (i.e., A000217(n) + A002620(n+1)).at n=33A001859
- Number of Hamiltonian cycles in C_5 X P_n.at n=4A003731
- Generalized Fibonacci numbers A_{n,3}.at n=25A006208
- Taylor series related to one in Ramanujan's Lost Notebook.at n=16A006305
- Numbers n such that n^32 + 1 is prime.at n=21A006315
- Expansion of (1+x^2)/((1-x)^2*(1-x^3)).at n=49A007980
- Coordination sequence T2 for Zeolite Code AFR.at n=22A008020
- Coordination sequence T2 for Zeolite Code ERI.at n=21A008094
- Coordination sequence T5 for Zeolite Code GOO.at n=20A008115
- Multiples of 17.at n=50A008599
- Multiples of 25.at n=34A008607
- 3x+1 sequence starting at 97.at n=59A008873
- 3x+1 sequence starting at 63.at n=48A008874
- 3x+1 sequence starting at 95.at n=46A008875
- 3x+1 sequence starting at 27.at n=52A008884