243404252 has 48 divisors (see below), whose sum is σ = 536481792. Its totient is φ = 94046400.

The previous prime is 243404251. The next prime is 243404261. The reversal of 243404252 is 252404342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243404251) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7877 + ... + 23427.

It is an arithmetic number, because the mean of its divisors is an integer number (11176704).

Almost surely, 2^243404252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243404252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268240896).

243404252 is an abundant number, since it is smaller than the sum of its proper divisors (293077540).

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

243404252 is a wasteful number, since it uses less digits than its factorization.

243404252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15618 (or 15616 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 243404252 is about 15601.4182688626. The cubic root of 243404252 is about 624.3709955511.

Adding to 243404252 its reverse (252404342), we get a palindrome (495808594).

The spelling of 243404252 in words is "two hundred forty-three million, four hundred four thousand, two hundred fifty-two".