239
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
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 240
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 238
- Möbius Function
- -1
- Radical
- 239
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 52
- Smith Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- yes
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 52
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- zweihundertneununddreißig· ordinal: zweihundertneununddreißigste
- English
- two hundred thirty-nine· ordinal: two hundred thirty-ninth
- Spanish
- doscientos treinta y nueve· ordinal: 239º
- French
- deux cent trente-neuf· ordinal: deux cent trente-neufième
- Italian
- duecentotrentanove· ordinal: 239º
- Latin
- ducenti triginta novem· ordinal: 239.
- Portuguese
- duzentos e trinta e nove· ordinal: 239º
Appears in sequences
- Number of nonnegative solutions to x^2 + y^2 + z^2 <= n^2.at n=7A000604
- Number of nonnegative solutions to x^2 + y^2 + z^2 <= n.at n=49A000606
- Genus of complete graph on n nodes.at n=56A000933
- Numbers k such that sum of squares of k consecutive integers >= 1 is a square.at n=27A001032
- Union of all numbers {p, q} where p and q are both primes or powers of primes and q = p+2.at n=47A001092
- Twin primes.at n=31A001097
- Primes with 7 as smallest primitive root.at n=1A001126
- Primes == +-1 (mod 8).at n=22A001132
- Table of prime factors of 10^n - 1 (with multiplicity).at n=26A001270
- Pell-Lucas numbers: numerators of continued fraction convergents to sqrt(2).at n=7A001333
- Lesser of twin primes.at n=16A001359
- Partial sums of A001462; also a(n) is the last occurrence of n in A001462.at n=34A001463
- Numbers k such that 3^k, 3^(k+1) and 3^(k+2) have the same number of digits.at n=11A001682
- Expansion of 1/((1+x)(1-x)^8).at n=4A001779
- Numbers k such that phi(k+2) = phi(k) + 2.at n=27A001838
- Primes p such that the congruence 2^x == 3 (mod p) is solvable.at n=31A001915
- Primes p such that the congruence 2^x = 5 (mod p) is solvable.at n=29A001916
- a(n) = floor((n+2/3)*(5+sqrt(13))/2); v-pile positions in the 3-Wythoff game.at n=55A001960
- v-pile positions of the 4-Wythoff game with i=3.at n=45A001968
- Prime determinants of forms with class number 2.at n=25A002052