789
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1056
- Proper Divisor Sum (Aliquot Sum)
- 267
- 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
- 524
- Möbius Function
- 1
- Radical
- 789
- 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
- 28
- 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
- siebenhundertneunundachtzig· ordinal: siebenhundertneunundachtzigste
- English
- seven hundred eighty-nine· ordinal: seven hundred eighty-ninth
- Spanish
- setecientos ochenta y nueve· ordinal: 789º
- French
- sept cent quatre-vingt-neuf· ordinal: sept cent quatre-vingt-neufième
- Italian
- settecentoottantanove· ordinal: 789º
- Latin
- septingenti octoginta novem· ordinal: 789.
- Portuguese
- setecentos e oitenta e nove· ordinal: 789º
Appears in sequences
- Number of twin prime pairs < square of n-th prime.at n=52A000885
- Decimal concatenation of n, n+1, and n+2.at n=7A001703
- Numbers k such that (k^2 + k + 1)/13 is prime.at n=38A002642
- Arrays of dumbbells.at n=8A002940
- Numbers that are the sum of 5 positive 4th powers.at n=53A003339
- Fibonacci numbers written backwards.at n=16A004091
- Reversals of Fibonacci numbers (sorted).at n=16A004170
- Coordination sequence T1 for Zeolite Code AWW.at n=20A008045
- Coordination sequence T1 for Zeolite Code LTL.at n=21A008138
- Coordination sequence T1 for Zeolite Code MEL.at n=18A008150
- Coordination sequence T4 for Zeolite Code MEL.at n=18A008153
- Coordination sequence T2 for Zeolite Code NES.at n=18A008206
- Coordination sequence T5 for Zeolite Code NES.at n=18A008209
- Expansion of (1+x)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=34A008762
- Numbers k such that phi(k + 12) | sigma(k).at n=52A015832
- Blum integers: numbers of the form p * q where p and q are distinct primes congruent to 3 (mod 4).at n=52A016105
- Numbers k such that the continued fraction for sqrt(k) has period 24.at n=6A020363
- a(n) = a(n-2) + c(n-1) for n >= 3, a( ) increasing, given a(1)=2, a(2)=3, where c( ) is complement of a( ).at n=48A022943
- a(n) = a(n-2) + c(n-1) for n >= 3, a( ) increasing, given a(1)=2, a(2)=4; where c( ) is complement of a( ).at n=48A022944
- Convolution of A023532 and primes.at n=24A023606