340243 has 4 divisors (see below), whose sum is σ = 343368. Its totient is φ = 337120.

The previous prime is 340237. The next prime is 340261. The reversal of 340243 is 342043.

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 340243 - 2⁵ = 340211 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340283) 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, 1393 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (85842).

2³⁴⁰²⁴³ is an apocalyptic number.

340243 is a deficient number, since it is larger than the sum of its proper divisors (3125).

340243 is a wasteful number, since it uses less digits than its factorization.

340243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 340243 is about 583.3035230478. The cubic root of 340243 is about 69.8119442181.

Adding to 340243 its reverse (342043), we get a palindrome (682286).

The spelling of 340243 in words is "three hundred forty thousand, two hundred forty-three", and thus it is an iban number.