243985 has 8 divisors (see below), whose sum is σ = 334656. Its totient is φ = 167280.

The previous prime is 243973. The next prime is 243989. The reversal of 243985 is 589342.

243985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

243985 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 243985 - 2⁵ = 243953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3451 + ... + 3520.

It is an arithmetic number, because the mean of its divisors is an integer number (41832).

2²⁴³⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

243985 is a deficient number, since it is larger than the sum of its proper divisors (90671).

243985 is an equidigital number, since it uses as much as digits as its factorization.

243985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6983.

The product of its digits is 8640, while the sum is 31.

The square root of 243985 is about 493.9483778696. The cubic root of 243985 is about 62.4867171773.

The spelling of 243985 in words is "two hundred forty-three thousand, nine hundred eighty-five".