243239 has 2 divisors, whose sum is σ = 243240. Its totient is φ = 243238.

The previous prime is 243233. The next prime is 243259. The reversal of 243239 is 932342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243239 is a prime.

It is a super-2 number, since 2×243239² = 118330422242, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁵ + 4⁸ + 2⁹ + 3 + 3¹¹ + 9 .

It is equal to p₂₁₄₈₈ and since 243239 and 21488 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243233) 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 as a sum of consecutive naturals, namely, 121619 + 121620.

It is an arithmetic number, because the mean of its divisors is an integer number (121620).

2²⁴³²³⁹ is an apocalyptic number.

243239 is a deficient number, since it is larger than the sum of its proper divisors (1).

243239 is an equidigital number, since it uses as much as digits as its factorization.

243239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 243239 is about 493.1926601238. The cubic root of 243239 is about 62.4229664256.

The spelling of 243239 in words is "two hundred forty-three thousand, two hundred thirty-nine".