243557816 has 16 divisors (see below), whose sum is σ = 456838800. Its totient is φ = 121734144.

The previous prime is 243557777. The next prime is 243557887. The reversal of 243557816 is 618755342.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 34040 + ... + 40568.

It is an arithmetic number, because the mean of its divisors is an integer number (28552425).

Almost surely, 2^243557816 is an apocalyptic number.

It is an amenable number.

243557816 is a deficient number, since it is larger than the sum of its proper divisors (213280984).

243557816 is a wasteful number, since it uses less digits than its factorization.

243557816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11198 (or 11194 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The square root of 243557816 is about 15606.3389685089. The cubic root of 243557816 is about 624.5022733877.

The spelling of 243557816 in words is "two hundred forty-three million, five hundred fifty-seven thousand, eight hundred sixteen".