243421407 has 24 divisors (see below), whose sum is σ = 371804160. Its totient is φ = 153038160.

The previous prime is 243421379. The next prime is 243421411. The reversal of 243421407 is 704124342.

243421407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243421407 - 2⁷ = 243421279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35682 + ... + 41952.

It is an arithmetic number, because the mean of its divisors is an integer number (15491840).

Almost surely, 2^243421407 is an apocalyptic number.

243421407 is a deficient number, since it is larger than the sum of its proper divisors (128382753).

243421407 is a wasteful number, since it uses less digits than its factorization.

243421407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6523 (or 6520 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 243421407 is about 15601.9680489354. The cubic root of 243421407 is about 624.3856636499.

Adding to 243421407 its reverse (704124342), we get a palindrome (947545749).

The spelling of 243421407 in words is "two hundred forty-three million, four hundred twenty-one thousand, four hundred seven".