243743 has 4 divisors (see below), whose sum is σ = 247248. Its totient is φ = 240240.

The previous prime is 243709. The next prime is 243769. The reversal of 243743 is 347342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347342 = 2 ⋅173671.

It is a cyclic number.

It is not a de Polignac number, because 243743 - 2⁸ = 243487 is a prime.

It is a d-powerful number, because it can be written as 2 + 4⁵ + 7 + 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 (243703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1646 + ... + 1787.

It is an arithmetic number, because the mean of its divisors is an integer number (61812).

2²⁴³⁷⁴³ is an apocalyptic number.

243743 is a deficient number, since it is larger than the sum of its proper divisors (3505).

243743 is an equidigital number, since it uses as much as digits as its factorization.

243743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504.

The product of its digits is 2016, while the sum is 23.

The square root of 243743 is about 493.7033522268. The cubic root of 243743 is about 62.4660508960.

The spelling of 243743 in words is "two hundred forty-three thousand, seven hundred forty-three", and thus it is an iban number.