13989 has 4 divisors (see below), whose sum is σ = 18656. Its totient is φ = 9324.

The previous prime is 13967. The next prime is 13997. The reversal of 13989 is 98931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13989 - 2⁹ = 13477 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999) 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, 2329 + ... + 2334.

It is an arithmetic number, because the mean of its divisors is an integer number (4664).

2¹³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

13989 is a deficient number, since it is larger than the sum of its proper divisors (4667).

13989 is an equidigital number, since it uses as much as digits as its factorization.

13989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4666.

The product of its digits is 1944, while the sum is 30.

The square root of 13989 is about 118.2751030437. The cubic root of 13989 is about 24.0951087105.

The spelling of 13989 in words is "thirteen thousand, nine hundred eighty-nine".