9943 has 4 divisors (see below), whose sum is σ = 10168. Its totient is φ = 9720.

The previous prime is 9941. The next prime is 9949. The reversal of 9943 is 3499.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9943 - 2¹ = 9941 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 13.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9941) 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, 21 + ... + 142.

It is an arithmetic number, because the mean of its divisors is an integer number (2542).

2⁹⁹⁴³ is an apocalyptic number.

9943 is a deficient number, since it is larger than the sum of its proper divisors (225).

9943 is a wasteful number, since it uses less digits than its factorization.

9943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224.

The product of its digits is 972, while the sum is 25.

The square root of 9943 is about 99.7145927134. The cubic root of 9943 is about 21.5033346189.

The spelling of 9943 in words is "nine thousand, nine hundred forty-three".