243399 has 12 divisors (see below), whose sum is σ = 353976. Its totient is φ = 147888.

The previous prime is 243391. The next prime is 243401. The reversal of 243399 is 993342.

It is not a de Polignac number, because 243399 - 2³ = 243391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3042 + ... + 3120.

It is an arithmetic number, because the mean of its divisors is an integer number (29498).

2²⁴³³⁹⁹ is an apocalyptic number.

243399 is a deficient number, since it is larger than the sum of its proper divisors (110577).

243399 is an equidigital number, since it uses as much as digits as its factorization.

243399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 95 counting only the distinct ones).

The product of its digits is 5832, while the sum is 30.

The square root of 243399 is about 493.3548418735. The cubic root of 243399 is about 62.4366504778.

The spelling of 243399 in words is "two hundred forty-three thousand, three hundred ninety-nine".