243424993 has 6 divisors (see below), whose sum is σ = 283167906. Its totient is φ = 208649952.

The previous prime is 243424981. The next prime is 243424999. The reversal of 243424993 is 399424342.

It is a happy number.

243424993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 226713249 + 16711744 = 15057^2 + 4088^2 .

It is not a de Polignac number, because 243424993 - 2¹³ = 243416801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243424999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2483880 + ... + 2483977.

It is an arithmetic number, because the mean of its divisors is an integer number (47194651).

Almost surely, 2^243424993 is an apocalyptic number.

It is an amenable number.

243424993 is a deficient number, since it is larger than the sum of its proper divisors (39742913).

243424993 is an equidigital number, since it uses as much as digits as its factorization.

243424993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4967871 (or 4967864 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 243424993 is about 15602.0829699114. The cubic root of 243424993 is about 624.3887297127.

It can be divided in two parts, 2434249 and 93, that added together give a palindrome (2434342).

The spelling of 243424993 in words is "two hundred forty-three million, four hundred twenty-four thousand, nine hundred ninety-three".