13863 has 4 divisors (see below), whose sum is σ = 18488. Its totient is φ = 9240.

The previous prime is 13859. The next prime is 13873. The reversal of 13863 is 36831.

13863 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36831 = 3 ⋅12277.

It is not a de Polignac number, because 13863 - 2² = 13859 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13873) 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, 2308 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (4622).

2¹³⁸⁶³ is an apocalyptic number.

13863 is a deficient number, since it is larger than the sum of its proper divisors (4625).

13863 is an equidigital number, since it uses as much as digits as its factorization.

13863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624.

The product of its digits is 432, while the sum is 21.

The square root of 13863 is about 117.7412417125. The cubic root of 13863 is about 24.0225482535.

Subtracting from 13863 its product of digits (432), we obtain a palindrome (13431).

The spelling of 13863 in words is "thirteen thousand, eight hundred sixty-three".