243021400 has 96 divisors (see below), whose sum is σ = 614246400. Its totient is φ = 89078400.

The previous prime is 243021397. The next prime is 243021403. The reversal of 243021400 is 4120342.

It is an interprime number because it is at equal distance from previous prime (243021397) and next prime (243021403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243021403) 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, 116769 + ... + 118831.

It is an arithmetic number, because the mean of its divisors is an integer number (6398400).

Almost surely, 2^243021400 is an apocalyptic number.

243021400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243021400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307123200).

243021400 is an abundant number, since it is smaller than the sum of its proper divisors (371225000).

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

243021400 is a wasteful number, since it uses less digits than its factorization.

243021400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129 (or 2120 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 243021400 is about 15589.1436583284. The cubic root of 243021400 is about 624.0434648115.

Adding to 243021400 its reverse (4120342), we get a palindrome (247141742).

The spelling of 243021400 in words is "two hundred forty-three million, twenty-one thousand, four hundred".