243889 has 2 divisors, whose sum is σ = 243890. Its totient is φ = 243888.

The previous prime is 243871. The next prime is 243911. The reversal of 243889 is 988342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 36864 = 455^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 243889 - 2⁵ = 243857 is a prime.

It is not a weakly prime, because it can be changed into another prime (243809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121944 + 121945.

It is an arithmetic number, because the mean of its divisors is an integer number (121945).

2²⁴³⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

243889 is a deficient number, since it is larger than the sum of its proper divisors (1).

243889 is an equidigital number, since it uses as much as digits as its factorization.

243889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 243889 is about 493.8511921622. The cubic root of 243889 is about 62.4785206190.

It can be divided in two parts, 2 and 43889, that multiplied together give a palindrome (87778).

The spelling of 243889 in words is "two hundred forty-three thousand, eight hundred eighty-nine".