12389 has 4 divisors (see below), whose sum is σ = 13356.
Its totient is φ = 11424.
The previous prime is 12379. The next prime is 12391. The reversal of 12389 is 98321.
12389 = T37 + T38 + ... +
12389 = 82 + 92 + ... + 332.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 3364 + 9025 = 58^2 + 95^2
It is a cyclic number.
It is not a de Polignac number, because 12389 - 24 = 12373 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is a plaindrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12329) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464 + ... + 489.
It is an arithmetic number, because the mean of its divisors is an integer number (3339).
212389 is an apocalyptic number.
It is an amenable number.
12389 is a deficient number, since it is larger than the sum of its proper divisors (967).
12389 is an equidigital number, since it uses as much as digits as its factorization.
12389 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 966.
The product of its digits is 432, while the sum is 23.
The square root of 12389 is about 111.3058848399.
The cubic root of 12389 is about 23.1390443055.
Adding to 12389 its product of digits (432), we get a palindrome (12821).
It can be divided in two parts, 123 and 89, that added together give a palindrome (212).
The spelling of 12389 in words is "twelve thousand, three hundred eighty-nine".