243397 has 16 divisors (see below), whose sum is σ = 316800. Its totient is φ = 181440.

The previous prime is 243391. The next prime is 243401. The reversal of 243397 is 793342.

It is a de Polignac number, because none of the positive numbers 2^k-243397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2179 + ... + 2287.

It is an arithmetic number, because the mean of its divisors is an integer number (19800).

2²⁴³³⁹⁷ is an apocalyptic number.

It is an amenable number.

243397 is a deficient number, since it is larger than the sum of its proper divisors (73403).

243397 is a wasteful number, since it uses less digits than its factorization.

243397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156.

The product of its digits is 4536, while the sum is 28.

The square root of 243397 is about 493.3528149307. The cubic root of 243397 is about 62.4364794641.

Subtracting 243397 from its reverse (793342), we obtain a palindrome (549945).

The spelling of 243397 in words is "two hundred forty-three thousand, three hundred ninety-seven".