243288393 has 4 divisors (see below), whose sum is σ = 324384528. Its totient is φ = 162192260.

The previous prime is 243288389. The next prime is 243288401. The reversal of 243288393 is 393882342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243288393 - 2² = 243288389 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243288373) 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, 40548063 + ... + 40548068.

It is an arithmetic number, because the mean of its divisors is an integer number (81096132).

Almost surely, 2^243288393 is an apocalyptic number.

It is an amenable number.

243288393 is a deficient number, since it is larger than the sum of its proper divisors (81096135).

243288393 is an equidigital number, since it uses as much as digits as its factorization.

243288393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81096134.

The product of its digits is 248832, while the sum is 42.

The square root of 243288393 is about 15597.7047349923. The cubic root of 243288393 is about 624.2719141817.

The spelling of 243288393 in words is "two hundred forty-three million, two hundred eighty-eight thousand, three hundred ninety-three".