243789197 has 8 divisors (see below), whose sum is σ = 258360696. Its totient is φ = 229243392.

The previous prime is 243789193. The next prime is 243789199. The reversal of 243789197 is 791987342.

It can be written as a sum of positive squares in 4 ways, for example, as 162537001 + 81252196 = 12749^2 + 9014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243789197 - 2² = 243789193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243789191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15233 + ... + 26825.

It is an arithmetic number, because the mean of its divisors is an integer number (32295087).

Almost surely, 2^243789197 is an apocalyptic number.

It is an amenable number.

243789197 is a deficient number, since it is larger than the sum of its proper divisors (14571499).

243789197 is a wasteful number, since it uses less digits than its factorization.

243789197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12847.

The product of its digits is 762048, while the sum is 50.

The square root of 243789197 is about 15613.7502541830. The cubic root of 243789197 is about 624.6999707683.

The spelling of 243789197 in words is "two hundred forty-three million, seven hundred eighty-nine thousand, one hundred ninety-seven".