13439 has 4 divisors (see below), whose sum is σ = 13680. Its totient is φ = 13200.

The previous prime is 13421. The next prime is 13441. The reversal of 13439 is 93431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93431 = 13 ⋅7187.

It is a cyclic number.

It is not a de Polignac number, because 13439 - 2⁸ = 13183 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 13439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13469) 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, 14 + ... + 164.

It is an arithmetic number, because the mean of its divisors is an integer number (3420).

2¹³⁴³⁹ is an apocalyptic number.

13439 is a deficient number, since it is larger than the sum of its proper divisors (241).

13439 is an equidigital number, since it uses as much as digits as its factorization.

13439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its digits is 324, while the sum is 20.

The square root of 13439 is about 115.9267009795. The cubic root of 13439 is about 23.7750981216.

The spelling of 13439 in words is "thirteen thousand, four hundred thirty-nine".