243424440 has 160 divisors (see below), whose sum is σ = 935146080. Its totient is φ = 55634688.

The previous prime is 243424439. The next prime is 243424451. The reversal of 243424440 is 44424342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 17314 + ... + 28046.

It is an arithmetic number, because the mean of its divisors is an integer number (5844663).

Almost surely, 2^243424440 is an apocalyptic number.

243424440 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 243424440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467573040).

243424440 is an abundant number, since it is smaller than the sum of its proper divisors (691721640).

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

243424440 is a wasteful number, since it uses less digits than its factorization.

243424440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10763 (or 10750 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

The square root of 243424440 is about 15602.0652479087. The cubic root of 243424440 is about 624.3882568946.

Adding to 243424440 its reverse (44424342), we get a palindrome (287848782).

It can be divided in two parts, 24342 and 4440, that added together give a palindrome (28782).

The spelling of 243424440 in words is "two hundred forty-three million, four hundred twenty-four thousand, four hundred forty".