13599 has 6 divisors (see below), whose sum is σ = 19656. Its totient is φ = 9060.

The previous prime is 13597. The next prime is 13613. The reversal of 13599 is 99531.

It is not a de Polignac number, because 13599 - 2¹ = 13597 is a prime.

13599 is a lucky 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 (13591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 747 + ... + 764.

It is an arithmetic number, because the mean of its divisors is an integer number (3276).

2¹³⁵⁹⁹ is an apocalyptic number.

13599 is a deficient number, since it is larger than the sum of its proper divisors (6057).

13599 is a wasteful number, since it uses less digits than its factorization.

13599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1514 counting only the distinct ones).

The product of its digits is 1215, while the sum is 27.

The square root of 13599 is about 116.6147503535. The cubic root of 13599 is about 23.8690787834.

It can be divided in two parts, 1 and 3599, that added together give a square (3600 = 60²).

The spelling of 13599 in words is "thirteen thousand, five hundred ninety-nine".