15943 has 4 divisors (see below), whose sum is σ = 16200. Its totient is φ = 15688.

The previous prime is 15937. The next prime is 15959. The reversal of 15943 is 34951.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34951 = 7 ⋅4993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15943 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15913) 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, 33 + ... + 181.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2¹⁵⁹⁴³ is an apocalyptic number.

15943 is a deficient number, since it is larger than the sum of its proper divisors (257).

15943 is a wasteful number, since it uses less digits than its factorization.

15943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256.

The product of its digits is 540, while the sum is 22.

The square root of 15943 is about 126.2655930965. The cubic root of 15943 is about 25.1684622688.

It can be divided in two parts, 159 and 43, that added together give a palindrome (202).

The spelling of 15943 in words is "fifteen thousand, nine hundred forty-three".