243248239 has 4 divisors (see below), whose sum is σ = 261959656. Its totient is φ = 224536824.

The previous prime is 243248237. The next prime is 243248261. The reversal of 243248239 is 932842342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932842342 = 2 ⋅466421171.

It is a cyclic number.

It is not a de Polignac number, because 243248239 - 2¹ = 243248237 is a prime.

It is a super-2 number, since 2×243248239² = 118339411553202242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243248198 and 243248207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243248231) 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, 9355689 + ... + 9355714.

It is an arithmetic number, because the mean of its divisors is an integer number (65489914).

Almost surely, 2^243248239 is an apocalyptic number.

243248239 is a deficient number, since it is larger than the sum of its proper divisors (18711417).

243248239 is a wasteful number, since it uses less digits than its factorization.

243248239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18711416.

The product of its digits is 82944, while the sum is 37.

The square root of 243248239 is about 15596.4175053119. The cubic root of 243248239 is about 624.2375675731.

The spelling of 243248239 in words is "two hundred forty-three million, two hundred forty-eight thousand, two hundred thirty-nine".