15863 has 4 divisors (see below), whose sum is σ = 16440. Its totient is φ = 15288.

The previous prime is 15859. The next prime is 15877. The reversal of 15863 is 36851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36851 = 43 ⋅857.

It is a cyclic number.

It is not a de Polignac number, because 15863 - 2² = 15859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 15863.

It is not an unprimeable number, because it can be changed into a prime (15803) 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, 245 + ... + 302.

It is an arithmetic number, because the mean of its divisors is an integer number (4110).

2¹⁵⁸⁶³ is an apocalyptic number.

15863 is a deficient number, since it is larger than the sum of its proper divisors (577).

15863 is an equidigital number, since it uses as much as digits as its factorization.

15863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its digits is 720, while the sum is 23.

The square root of 15863 is about 125.9484021336. The cubic root of 15863 is about 25.1262942495.

It can be divided in two parts, 15 and 863, that added together give a palindrome (878).

The spelling of 15863 in words is "fifteen thousand, eight hundred sixty-three".