99943 has 4 divisors (see below), whose sum is σ = 105840. Its totient is φ = 94048.

The previous prime is 99929. The next prime is 99961. The reversal of 99943 is 34999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34999 = 31 ⋅1129.

It is a cyclic number.

It is not a de Polignac number, because 99943 - 2⁹ = 99431 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 99899 and 99908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99923) 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, 2923 + ... + 2956.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2⁹⁹⁹⁴³ is an apocalyptic number.

99943 is a deficient number, since it is larger than the sum of its proper divisors (5897).

99943 is a wasteful number, since it uses less digits than its factorization.

99943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5896.

The product of its digits is 8748, while the sum is 34.

The square root of 99943 is about 316.1376282571. The cubic root of 99943 is about 46.4070676412.

The spelling of 99943 in words is "ninety-nine thousand, nine hundred forty-three".