439 has 2 divisors, whose sum is σ = 440.
Its totient is φ = 438.
The previous prime is 433. The next prime is 443. The reversal of 439 is 934.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 439 - 23 = 431 is a prime.
It is a plaindrome in base 8, base 11, base 13 and base 14.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (431) 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, 219 + 220.
It is an arithmetic number, because the mean of its divisors is an integer number (220).
439 is a deficient number, since it is larger than the sum of its proper divisors (1).
439 is an equidigital number, since it uses as much as digits as its factorization.
439 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 108, while the sum is 16.
The square root of 439 is about 20.9523268398.
The cubic root of 439 is about 7.6001385016.
The spelling of 439 in words is "four hundred thirty-nine", and thus it is an aban number.