243421434 has 12 divisors (see below), whose sum is σ = 527413146. Its totient is φ = 81140472.

The previous prime is 243421417. The next prime is 243421481. The reversal of 243421434 is 434124342.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 156875625 + 86545809 = 12525^2 + 9303^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243421398 and 243421407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6761689 + ... + 6761724.

Almost surely, 2^243421434 is an apocalyptic number.

243421434 is an abundant number, since it is smaller than the sum of its proper divisors (283991712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243421434 is a wasteful number, since it uses less digits than its factorization.

243421434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13523421 (or 13523418 counting only the distinct ones).

The product of its digits is 9216, while the sum is 27.

The square root of 243421434 is about 15601.9689142108. The cubic root of 243421434 is about 624.3856867352.

Adding to 243421434 its reverse (434124342), we get a palindrome (677545776).

The spelling of 243421434 in words is "two hundred forty-three million, four hundred twenty-one thousand, four hundred thirty-four".