243845 has 8 divisors (see below), whose sum is σ = 334464. Its totient is φ = 167184.

The previous prime is 243839. The next prime is 243851. The reversal of 243845 is 548342.

243845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (243839) and next prime (243851).

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 243845 - 2⁴ = 243829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3449 + ... + 3518.

It is an arithmetic number, because the mean of its divisors is an integer number (41808).

2²⁴³⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

243845 is a deficient number, since it is larger than the sum of its proper divisors (90619).

243845 is an equidigital number, since it uses as much as digits as its factorization.

243845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6979.

The product of its digits is 3840, while the sum is 26.

The square root of 243845 is about 493.8066423207. The cubic root of 243845 is about 62.4747631443.

It can be divided in two parts, 24384 and 5, that added together give a cube (24389 = 29³).

The spelling of 243845 in words is "two hundred forty-three thousand, eight hundred forty-five".