1439 has 2 divisors, whose sum is σ = 1440. Its totient is φ = 1438.
The previous prime is 1433. The next prime is 1447. The reversal of 1439 is 9341.
It is a weak prime.
It is an emirp because it is prime and its reverse (9341) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1439 - 24 = 1423 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a plaindrome in base 12 and base 16.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1433) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719 + 720.
It is an arithmetic number, because the mean of its divisors is an integer number (720).
1439 is a deficient number, since it is larger than the sum of its proper divisors (1).
1439 is an equidigital number, since it uses as much as digits as its factorization.
1439 is an evil number, because the sum of its binary digits is even.
The product of its digits is 108, while the sum is 17.
The square root of 1439 is about 37.9341534768. The cubic root of 1439 is about 11.2898177523.
Subtracting from 1439 its product of digits (108), we obtain a palindrome (1331).
The spelling of 1439 in words is "one thousand, four hundred thirty-nine".
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