243895 has 4 divisors (see below), whose sum is σ = 292680. Its totient is φ = 195112.

The previous prime is 243889. The next prime is 243911. The reversal of 243895 is 598342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 598342 = 2 ⋅299171.

It is a cyclic number.

It is not a de Polignac number, because 243895 - 2⁵ = 243863 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24385 + ... + 24394.

It is an arithmetic number, because the mean of its divisors is an integer number (73170).

2²⁴³⁸⁹⁵ is an apocalyptic number.

243895 is a deficient number, since it is larger than the sum of its proper divisors (48785).

243895 is an equidigital number, since it uses as much as digits as its factorization.

243895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48784.

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

The square root of 243895 is about 493.8572668292. The cubic root of 243895 is about 62.4790329669.

The spelling of 243895 in words is "two hundred forty-three thousand, eight hundred ninety-five".