243893 has 8 divisors (see below), whose sum is σ = 267288. Its totient is φ = 221184.

The previous prime is 243889. The next prime is 243911. The reversal of 243893 is 398342.

It can be written as a sum of positive squares in 4 ways, for example, as 69169 + 174724 = 263^2 + 418^2 .

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 243893 - 2² = 243889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 821 + ... + 1077.

It is an arithmetic number, because the mean of its divisors is an integer number (33411).

2²⁴³⁸⁹³ is an apocalyptic number.

It is an amenable number.

243893 is a deficient number, since it is larger than the sum of its proper divisors (23395).

243893 is a wasteful number, since it uses less digits than its factorization.

243893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its digits is 5184, while the sum is 29.

The square root of 243893 is about 493.8552419485. The cubic root of 243893 is about 62.4788621852.

Subtracting 243893 from its reverse (398342), we obtain a square (154449 = 393²).

The spelling of 243893 in words is "two hundred forty-three thousand, eight hundred ninety-three".