243823643 has 4 divisors (see below), whose sum is σ = 278655600. Its totient is φ = 208991688.

The previous prime is 243823627. The next prime is 243823663. The reversal of 243823643 is 346328342.

It is a happy number.

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 243823643 - 2⁴ = 243823627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243823663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17415968 + ... + 17415981.

It is an arithmetic number, because the mean of its divisors is an integer number (69663900).

Almost surely, 2^243823643 is an apocalyptic number.

243823643 is a deficient number, since it is larger than the sum of its proper divisors (34831957).

243823643 is an equidigital number, since it uses as much as digits as its factorization.

243823643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34831956.

The product of its digits is 82944, while the sum is 35.

The square root of 243823643 is about 15614.8532814113. The cubic root of 243823643 is about 624.7293915439.

The spelling of 243823643 in words is "two hundred forty-three million, eight hundred twenty-three thousand, six hundred forty-three".