243540212 has 12 divisors (see below), whose sum is σ = 427036260. Its totient is φ = 121529856.

The previous prime is 243540211. The next prime is 243540251. The reversal of 243540212 is 212045342.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 170198116 + 73342096 = 13046^2 + 8564^2 .

It is a super-3 number, since 3×243540212³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243540211) 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 3 ways as a sum of consecutive naturals, for example, 57773 + ... + 61844.

It is an arithmetic number, because the mean of its divisors is an integer number (35586355).

Almost surely, 2^243540212 is an apocalyptic number.

It is an amenable number.

243540212 is a deficient number, since it is larger than the sum of its proper divisors (183496048).

243540212 is a wasteful number, since it uses less digits than its factorization.

243540212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120130 (or 120128 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 243540212 is about 15605.7749567268. The cubic root of 243540212 is about 624.4872269905.

Adding to 243540212 its reverse (212045342), we get a palindrome (455585554).

The spelling of 243540212 in words is "two hundred forty-three million, five hundred forty thousand, two hundred twelve".