243997793 has 8 divisors (see below), whose sum is σ = 271828200. Its totient is φ = 217461888.

The previous prime is 243997769. The next prime is 243997811. The reversal of 243997793 is 397799342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29463184 + 214534609 = 5428^2 + 14647^2 .

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 243997793 - 2¹⁰ = 243996769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243997723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323228 + ... + 323981.

It is an arithmetic number, because the mean of its divisors is an integer number (33978525).

Almost surely, 2^243997793 is an apocalyptic number.

It is an amenable number.

243997793 is a deficient number, since it is larger than the sum of its proper divisors (27830407).

243997793 is a wasteful number, since it uses less digits than its factorization.

243997793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647251.

The product of its digits is 2571912, while the sum is 53.

The square root of 243997793 is about 15620.4287073051. The cubic root of 243997793 is about 624.8780929167.

The spelling of 243997793 in words is "two hundred forty-three million, nine hundred ninety-seven thousand, seven hundred ninety-three".