243943 has 4 divisors (see below), whose sum is σ = 278800. Its totient is φ = 209088.

The previous prime is 243931. The next prime is 243953. The reversal of 243943 is 349342.

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 243943 - 2⁵ = 243911 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 4⁵ + 9² + 3³ + 4⁸ + 3¹¹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243953) 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, 17418 + ... + 17431.

It is an arithmetic number, because the mean of its divisors is an integer number (69700).

2²⁴³⁹⁴³ is an apocalyptic number.

243943 is a deficient number, since it is larger than the sum of its proper divisors (34857).

243943 is an equidigital number, since it uses as much as digits as its factorization.

243943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34856.

The product of its digits is 2592, while the sum is 25.

The square root of 243943 is about 493.9058614756. The cubic root of 243943 is about 62.4831314476.

The spelling of 243943 in words is "two hundred forty-three thousand, nine hundred forty-three".