243995 has 4 divisors (see below), whose sum is σ = 292800. Its totient is φ = 195192.

The previous prime is 243989. The next prime is 244003. The reversal of 243995 is 599342.

243995 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599342 = 2 ⋅299671.

It is a cyclic number.

It is not a de Polignac number, because 243995 - 2⁶ = 243931 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24395 + ... + 24404.

It is an arithmetic number, because the mean of its divisors is an integer number (73200).

2²⁴³⁹⁹⁵ is an apocalyptic number.

243995 is a deficient number, since it is larger than the sum of its proper divisors (48805).

243995 is an equidigital number, since it uses as much as digits as its factorization.

243995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48804.

The product of its digits is 9720, while the sum is 32.

The square root of 243995 is about 493.9585002811. The cubic root of 243995 is about 62.4875708618.

It can be divided in two parts, 2 and 43995, that multiplied together give a triangular number (87990 = T₄₁₉).

The spelling of 243995 in words is "two hundred forty-three thousand, nine hundred ninety-five".