15899 has 4 divisors (see below), whose sum is σ = 17136. Its totient is φ = 14664.

The previous prime is 15889. The next prime is 15901. The reversal of 15899 is 99851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99851 = 31 ⋅3221.

It is not a de Polignac number, because 15899 - 2⁸ = 15643 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (15809) 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, 599 + ... + 624.

It is an arithmetic number, because the mean of its divisors is an integer number (4284).

2¹⁵⁸⁹⁹ is an apocalyptic number.

15899 is a deficient number, since it is larger than the sum of its proper divisors (1237).

15899 is a wasteful number, since it uses less digits than its factorization.

15899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 3240, while the sum is 32.

The square root of 15899 is about 126.0912368089. The cubic root of 15899 is about 25.1452873610.

Adding to 15899 its sum of digits (32), we get a triangular number (15931 = T₁₇₈).

The spelling of 15899 in words is "fifteen thousand, eight hundred ninety-nine".