243172393 has 4 divisors (see below), whose sum is σ = 255970960. Its totient is φ = 230373828.

The previous prime is 243172379. The next prime is 243172441. The reversal of 243172393 is 393271342.

243172393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 243172393 - 2¹⁷ = 243041321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243172343) 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, 6399255 + ... + 6399292.

It is an arithmetic number, because the mean of its divisors is an integer number (63992740).

Almost surely, 2^243172393 is an apocalyptic number.

It is an amenable number.

243172393 is a deficient number, since it is larger than the sum of its proper divisors (12798567).

243172393 is a wasteful number, since it uses less digits than its factorization.

243172393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12798566.

The product of its digits is 27216, while the sum is 34.

The square root of 243172393 is about 15593.9857958124. The cubic root of 243172393 is about 624.1726807117.

The spelling of 243172393 in words is "two hundred forty-three million, one hundred seventy-two thousand, three hundred ninety-three".