243612440 has 64 divisors (see below), whose sum is σ = 566105760. Its totient is φ = 94279680.

The previous prime is 243612437. The next prime is 243612443. The reversal of 243612440 is 44216342.

It is an interprime number because it is at equal distance from previous prime (243612437) and next prime (243612443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243612443) 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, 356339 + ... + 357021.

Almost surely, 2^243612440 is an apocalyptic number.

243612440 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 243612440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283052880).

243612440 is an abundant number, since it is smaller than the sum of its proper divisors (322493320).

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

243612440 is a wasteful number, since it uses less digits than its factorization.

243612440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 243612440 is about 15608.0889285011. The cubic root of 243612440 is about 624.5489567076.

Adding to 243612440 its reverse (44216342), we get a palindrome (287828782).

The spelling of 243612440 in words is "two hundred forty-three million, six hundred twelve thousand, four hundred forty".