243421428 has 24 divisors (see below), whose sum is σ = 581837760. Its totient is φ = 79161280.

The previous prime is 243421417. The next prime is 243421481. The reversal of 243421428 is 824124342.

243421428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 243421395 and 243421404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246888 + ... + 247871.

It is an arithmetic number, because the mean of its divisors is an integer number (24243240).

Almost surely, 2^243421428 is an apocalyptic number.

It is an amenable number.

243421428 is an abundant number, since it is smaller than the sum of its proper divisors (338416332).

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

243421428 is a wasteful number, since it uses less digits than its factorization.

243421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494807 (or 494805 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

The square root of 243421428 is about 15601.9687219274. The cubic root of 243421428 is about 624.3856816052.

The spelling of 243421428 in words is "two hundred forty-three million, four hundred twenty-one thousand, four hundred twenty-eight".