15399 has 12 divisors (see below), whose sum is σ = 23400. Its totient is φ = 9744.

The previous prime is 15391. The next prime is 15401. The reversal of 15399 is 99351.

15399 = T₁₇ + T₁₈ + ... + T₄₅.

It is not a de Polignac number, because 15399 - 2³ = 15391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232 + ... + 290.

It is an arithmetic number, because the mean of its divisors is an integer number (1950).

2¹⁵³⁹⁹ is an apocalyptic number.

15399 is a deficient number, since it is larger than the sum of its proper divisors (8001).

15399 is a wasteful number, since it uses less digits than its factorization.

15399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 91 counting only the distinct ones).

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

The square root of 15399 is about 124.0927072797. The cubic root of 15399 is about 24.8788808201.

It can be divided in two parts, 153 and 99, that added together give a palindrome (252).

The spelling of 15399 in words is "fifteen thousand, three hundred ninety-nine".