445
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
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 540
- Proper Divisor Sum (Aliquot Sum)
- 95
- 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
- 352
- Möbius Function
- 1
- Radical
- 445
- 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
- 71
- 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
- vierhundertfünfundvierzig· ordinal: vierhundertfünfundvierzigste
- English
- four hundred forty-five· ordinal: four hundred forty-fifth
- Spanish
- cuatrocientos cuarenta y cinco· ordinal: 445º
- French
- quatre cent quarante-cinq· ordinal: quatre cent quarante-cinqième
- Italian
- quattrocentoquarantacinque· ordinal: 445º
- Latin
- quadringenti quadraginta quinque· ordinal: 445.
- Portuguese
- quatrocentos e quarenta e cinco· ordinal: 445º
Appears in sequences
- Number of series-reduced trees with n nodes.at n=17A000014
- Partitions into non-integral powers (see Comments for precise definition).at n=8A000234
- Generalized Stirling numbers, [n+7,7]_3.at n=2A001714
- Primes multiplied by 5.at n=23A001750
- Number of solutions to a linear inequality.at n=19A002797
- G.f.: 1/((1-x)*(1-x^2)*(1-x^3)^2*(1-x^4)*(1-x^5)).at n=20A003402
- Divisors of 2^44 - 1.at n=11A003549
- Discriminants of quadratic fields whose fundamental unit has norm -1.at n=54A003653
- Expansion of (1 + x - x^5) / (1 - x)^3.at n=25A004120
- a(n) = floor(100*log_2(n)).at n=21A004262
- Divisible only by primes congruent to 5 mod 7.at n=22A004623
- Primes written in base 6.at n=39A004680
- Primes written in base 7.at n=49A004681
- Numbers of the form 8k+5; or, numbers whose binary expansion ends in 101.at n=55A004770
- Numbers k such that k, k+1 and k+2 have the same number of divisors.at n=13A005238
- P-positions in Epstein's Put or Take a Square game.at n=16A005240
- Number of protruded partitions of n with largest part at most 2.at n=10A005403
- Let F(x) = 1 + x + 4x^2 + 9x^3 + ... = g.f. for A002835 (solid partitions restricted to two planes) and expand (1-x)*(1-x^2)*(1-x^3)*...*F(x) in powers of x.at n=10A005980
- Rabbytes: group eight successive Fibonacci numbers in reversed binary and translate to decimal.at n=5A006225
- Cald's sequence: a(n+1) = a(n) - prime(n) if that value is positive and new, otherwise a(n) + prime(n) if new, otherwise 0; start with a(1)=1.at n=79A006509