13939 has 4 divisors (see below), whose sum is σ = 14256. Its totient is φ = 13624.

The previous prime is 13933. The next prime is 13963. The reversal of 13939 is 93931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13939 - 2³ = 13931 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7 and base 11.

It is not an unprimeable number, because it can be changed into a prime (13931) 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, 79 + ... + 184.

It is an arithmetic number, because the mean of its divisors is an integer number (3564).

2¹³⁹³⁹ is an apocalyptic number.

13939 is a deficient number, since it is larger than the sum of its proper divisors (317).

13939 is an equidigital number, since it uses as much as digits as its factorization.

13939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its digits is 729, while the sum is 25.

The square root of 13939 is about 118.0635422135. The cubic root of 13939 is about 24.0663672314.

The spelling of 13939 in words is "thirteen thousand, nine hundred thirty-nine".