• 239 can be written using four 4's:
It is a happy number.
239 is nontrivially palindromic in base 14.
239 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.
It is a strong prime.
239 is a truncatable prime.
It is a cyclic number.
It is a Sophie Germain prime.
It is a Chen prime.
239 is an undulating number in base 14.
It is a plaindrome in base 8, base 10, base 12, base 13 and base 16.
It is a congruent number.
It is a panconsummate number.
239 is an equidigital number, since it uses as much as digits as its factorization.
239 is an odious number, because the sum of its binary digits is odd.
The square root of 239 is about 15.4596248337. The cubic root of 239 is about 6.2058217949.
Adding to 239 its sum of digits (14), we get a triangular number (253 = T22).
Subtracting from 239 its sum of digits (14), we obtain a square (225 = 152).
The spelling of 239 in words is "two hundred thirty-nine", and thus it is an aban number.