15823 has 2 divisors, whose sum is σ = 15824. Its totient is φ = 15822.

The previous prime is 15817. The next prime is 15859. The reversal of 15823 is 32851.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15823 - 2⁵ = 15791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7911 + 7912.

It is an arithmetic number, because the mean of its divisors is an integer number (7912).

2¹⁵⁸²³ is an apocalyptic number.

15823 is a deficient number, since it is larger than the sum of its proper divisors (1).

15823 is an equidigital number, since it uses as much as digits as its factorization.

15823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 15823 is about 125.7895067166. The cubic root of 15823 is about 25.1051570595.

It can be divided in two parts, 158 and 23, that added together give a palindrome (181).

The spelling of 15823 in words is "fifteen thousand, eight hundred twenty-three".