855
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 1560
- Proper Divisor Sum (Aliquot Sum)
- 705
- 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
- 432
- Möbius Function
- 0
- Radical
- 285
- 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
- 54
- 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
- no
- Odd
- yes
Names
- German
- achthundertfünfundfünfzig· ordinal: achthundertfünfundfünfzigste
- English
- eight hundred fifty-five· ordinal: eight hundred fifty-fifth
- Spanish
- ochocientos cincuenta y cinco· ordinal: 855º
- French
- huit cent cinquante-cinq· ordinal: huit cent cinquante-cinqième
- Italian
- ottocentocinquantacinque· ordinal: 855º
- Latin
- octingenti quinquaginta quinque· ordinal: 855.
- Portuguese
- oitocentos e cinquenta e cinco· ordinal: 855º
Appears in sequences
- Euler transform of A000292.at n=6A000335
- 10-gonal (or decagonal) numbers: a(n) = n*(4*n-3).at n=15A001107
- Numbers that are the sum of 3 nonnegative cubes in more than 1 way.at n=4A001239
- Numbers that are the sum of 2 positive cubes.at n=39A003325
- Divisors of 2^36 - 1.at n=55A003543
- Numbers that are a sum of distinct positive cubes in more than one way.at n=21A003998
- Sums of two nonnegative cubes.at n=49A004999
- Centered cube numbers: n^3 + (n+1)^3.at n=7A005898
- Prime(n)*...*prime(a(n)) is the least product of consecutive primes that is non-deficient.at n=20A007684
- Prime(n)*...*prime(a(n)) is the least product of consecutive primes which is abundant.at n=20A007707
- Coordination sequence T1 for Zeolite Code DOH.at n=18A008078
- Coordination sequence T2 for Zeolite Code FER.at n=18A008107
- Coordination sequence T2 for Zeolite Code MOR.at n=19A008183
- Expansion of Jacobi theta constant theta_2^5 /32.at n=49A008439
- Multiples of 19.at n=45A008601
- Orders of non-cyclic simple groups (divided by 4).at n=8A008976
- Coordination sequence T3 for Zeolite Code -CLO.at n=26A009852
- Coordination sequence T2 for Zeolite Code VNI.at n=18A009908
- a(n) = floor( n*(n-1)*(n-2)/8 ).at n=20A011890
- Numbers k such that Phi(k,x) is a cyclotomic polynomial containing a coefficient with an absolute value greater than one.at n=47A013590