243240212 has 12 divisors (see below), whose sum is σ = 428778420. Its totient is φ = 120732096.

The previous prime is 243240191. The next prime is 243240227. The reversal of 243240212 is 212042342.

It can be written as a sum of positive squares in 2 ways, for example, as 194993296 + 48246916 = 13964^2 + 6946^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221387 + ... + 222482.

It is an arithmetic number, because the mean of its divisors is an integer number (35731535).

Almost surely, 2^243240212 is an apocalyptic number.

It is an amenable number.

243240212 is a deficient number, since it is larger than the sum of its proper divisors (185538208).

243240212 is a wasteful number, since it uses less digits than its factorization.

243240212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444010 (or 444008 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243240212 is about 15596.1601684517. The cubic root of 243240212 is about 624.2307010484.

Adding to 243240212 its reverse (212042342), we get a palindrome (455282554).

The spelling of 243240212 in words is "two hundred forty-three million, two hundred forty thousand, two hundred twelve".