243997723 has 2 divisors, whose sum is σ = 243997724. Its totient is φ = 243997722.

The previous prime is 243997717. The next prime is 243997739. The reversal of 243997723 is 327799342.

It is a happy number.

243997723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243997723 is a prime.

It is not a weakly prime, because it can be changed into another prime (243997763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121998861 + 121998862.

It is an arithmetic number, because the mean of its divisors is an integer number (121998862).

Almost surely, 2^243997723 is an apocalyptic number.

243997723 is a deficient number, since it is larger than the sum of its proper divisors (1).

243997723 is an equidigital number, since it uses as much as digits as its factorization.

243997723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 46.

The square root of 243997723 is about 15620.4264666494. The cubic root of 243997723 is about 624.8780331601.

The spelling of 243997723 in words is "two hundred forty-three million, nine hundred ninety-seven thousand, seven hundred twenty-three".