905
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1092
- Proper Divisor Sum (Aliquot Sum)
- 187
- 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
- 720
- Möbius Function
- 1
- Radical
- 905
- 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
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 67
- Smith Number
- no
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
- neunhundertfünf· ordinal: neunhundertfünfste
- English
- nine hundred five· ordinal: nine hundred fifth
- Spanish
- novecientos cinco· ordinal: 905º
- French
- neuf cent cinq· ordinal: neuf cent cinqième
- Italian
- novecentocinque· ordinal: 905º
- Latin
- nongenti quinque· ordinal: 905.
- Portuguese
- novecentos e cinco· ordinal: 905º
Appears in sequences
- Numbers beginning with letter 'n' in English.at n=17A000981
- Primes multiplied by 5.at n=41A001750
- Nearest integer to 4 * Pi * n^3 / 3.at n=6A002101
- Number of integral points in a certain sequence of open quadrilaterals.at n=47A002578
- Roman numerals with 1 letter, in alphabetical order; then those with 2 letters, etc.at n=55A003588
- Add 4, then reverse digits; start with 0.at n=17A003608
- a(n) = cost of minimal multiplication-cost addition chain for n.at n=51A005766
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=13A006285
- Add 8, then reverse digits!.at n=22A007399
- Coordination sequence T3 for Zeolite Code LTN.at n=21A008142
- Coordination sequence T1 for Zeolite Code MER.at n=22A008160
- Numbers that do not contain the letter 't'.at n=51A008523
- Molien series for alternating group Alt_12 (or A_12).at n=22A008635
- Number of partitions of n into at most 12 parts.at n=22A008641
- Coordination sequence T2 for Zeolite Code ZON.at n=21A009920
- Partial sums of A003136.at n=27A014146
- Expansion of x/(1 - 4*x - 11*x^2).at n=5A015534
- Positive integers n such that 2^n == 2^5 (mod n).at n=34A015925
- Expansion of 1/((1-8*x)*(1-9*x)*(1-10*x)*(1-11*x)).at n=2A016075
- Add 4, then reverse digits; start with 3.at n=50A016081