243220343 has 4 divisors (see below), whose sum is σ = 257527440. Its totient is φ = 228913248.

The previous prime is 243220321. The next prime is 243220363. The reversal of 243220343 is 343022342.

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 243220343 - 2⁶ = 243220279 is a prime.

It is a super-2 number, since 2×243220343² = 118312270498075298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243220363) 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, 7153523 + ... + 7153556.

It is an arithmetic number, because the mean of its divisors is an integer number (64381860).

Almost surely, 2^243220343 is an apocalyptic number.

243220343 is a deficient number, since it is larger than the sum of its proper divisors (14307097).

243220343 is a wasteful number, since it uses less digits than its factorization.

243220343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14307096.

The product of its (nonzero) digits is 3456, while the sum is 23.

The square root of 243220343 is about 15595.5231717310. The cubic root of 243220343 is about 624.2137038897.

Adding to 243220343 its reverse (343022342), we get a palindrome (586242685).

The spelling of 243220343 in words is "two hundred forty-three million, two hundred twenty thousand, three hundred forty-three".