243421400 has 24 divisors (see below), whose sum is σ = 565955220. Its totient is φ = 97368480.

The previous prime is 243421379. The next prime is 243421411. The reversal of 243421400 is 4124342.

243421400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 608354 + ... + 608753.

Almost surely, 2^243421400 is an apocalyptic number.

243421400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243421400 is an abundant number, since it is smaller than the sum of its proper divisors (322533820).

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

243421400 is a wasteful number, since it uses less digits than its factorization.

243421400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217123 (or 1217114 counting only the distinct ones).

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

The square root of 243421400 is about 15601.9678246047. The cubic root of 243421400 is about 624.3856576648.

Adding to 243421400 its reverse (4124342), we get a palindrome (247545742).

The spelling of 243421400 in words is "two hundred forty-three million, four hundred twenty-one thousand, four hundred".