243420259 has 4 divisors (see below), whose sum is σ = 243453600. Its totient is φ = 243386920.

The previous prime is 243420227. The next prime is 243420283. The reversal of 243420259 is 952024342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 243420259 - 2⁵ = 243420227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243420259.

It is not an unprimeable number, because it can be changed into a prime (243220259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472 + ... + 22069.

It is an arithmetic number, because the mean of its divisors is an integer number (60863400).

Almost surely, 2^243420259 is an apocalyptic number.

243420259 is a deficient number, since it is larger than the sum of its proper divisors (33341).

243420259 is a wasteful number, since it uses less digits than its factorization.

243420259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33340.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 243420259 is about 15601.9312586615. The cubic root of 243420259 is about 624.3846820930.

The spelling of 243420259 in words is "two hundred forty-three million, four hundred twenty thousand, two hundred fifty-nine".