243983985 has 48 divisors (see below), whose sum is σ = 457612416. Its totient is φ = 110675712.

The previous prime is 243983953. The next prime is 243984001. The reversal of 243983985 is 589389342.

It is not a de Polignac number, because 243983985 - 2⁵ = 243983953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99484 + ... + 101906.

It is an arithmetic number, because the mean of its divisors is an integer number (9533592).

Almost surely, 2^243983985 is an apocalyptic number.

It is an amenable number.

243983985 is a deficient number, since it is larger than the sum of its proper divisors (213628431).

243983985 is a wasteful number, since it uses less digits than its factorization.

243983985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582 (or 2575 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The square root of 243983985 is about 15619.9867157434. The cubic root of 243983985 is about 624.8663052699.

The spelling of 243983985 in words is "two hundred forty-three million, nine hundred eighty-three thousand, nine hundred eighty-five".