40243 has 4 divisors (see below), whose sum is σ = 46000. Its totient is φ = 34488.

The previous prime is 40241. The next prime is 40253. The reversal of 40243 is 34204.

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 40243 - 2¹ = 40241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40241) 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, 2868 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (11500).

2⁴⁰²⁴³ is an apocalyptic number.

40243 is a deficient number, since it is larger than the sum of its proper divisors (5757).

40243 is an equidigital number, since it uses as much as digits as its factorization.

40243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 40243 is about 200.6065801513. The cubic root of 40243 is about 34.2686331914.

Adding to 40243 its reverse (34204), we get a palindrome (74447).

The spelling of 40243 in words is "forty thousand, two hundred forty-three", and thus it is an iban number.