243869 has 6 divisors (see below), whose sum is σ = 255486. Its totient is φ = 232760.

The previous prime is 243863. The next prime is 243871. The reversal of 243869 is 968342.

It can be written as a sum of positive squares in only one way, i.e., 190969 + 52900 = 437^2 + 230^2 .

It is not a de Polignac number, because 243869 - 2⁸ = 243613 is a prime.

It is a super-2 number, since 2×243869² = 118944178322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243869.

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 5 ways as a sum of consecutive naturals, for example, 299 + ... + 759.

It is an arithmetic number, because the mean of its divisors is an integer number (42581).

2²⁴³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

243869 is a deficient number, since it is larger than the sum of its proper divisors (11617).

243869 is an equidigital number, since it uses as much as digits as its factorization.

243869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 484 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 243869 is about 493.8309427324. The cubic root of 243869 is about 62.4768127320.

The spelling of 243869 in words is "two hundred forty-three thousand, eight hundred sixty-nine".