13399 has 2 divisors, whose sum is σ = 13400. Its totient is φ = 13398.

The previous prime is 13397. The next prime is 13411. The reversal of 13399 is 99331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13399 - 2¹ = 13397 is a prime.

Together with 13397, it forms a pair of twin primes.

It is an Ulam number.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6699 + 6700.

It is an arithmetic number, because the mean of its divisors is an integer number (6700).

2¹³³⁹⁹ is an apocalyptic number.

13399 is a deficient number, since it is larger than the sum of its proper divisors (1).

13399 is an equidigital number, since it uses as much as digits as its factorization.

13399 is an evil number, because the sum of its binary digits is even.

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

The square root of 13399 is about 115.7540496052. The cubic root of 13399 is about 23.7514865182.

It can be divided in two parts, 133 and 99, that added together give a palindrome (232).

The spelling of 13399 in words is "thirteen thousand, three hundred ninety-nine".