• 239 can be written using four 4's:
239 has 2 divisors, whose sum is σ = 240. Its totient is φ = 238.
The previous prime is 233. The next prime is 241. The reversal of 239 is 932.
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 not a de Polignac number, because 239 - 24 = 223 is a prime.
It is a Sophie Germain prime.
Together with 241, it forms a pair of twin primes.
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.
It is not a weakly prime, because it can be changed into another prime (233) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119 + 120.
It is an arithmetic number, because the mean of its divisors is an integer number (120).
239 is a deficient number, since it is larger than the sum of its proper divisors (1).
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 product of its digits is 54, while the sum is 14.
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).
It can be divided in two parts, 23 and 9, that added together give a 5-th power (32 = 25).
The spelling of 239 in words is "two hundred thirty-nine", and thus it is an aban number.
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