243733440 has 112 divisors (see below), whose sum is σ = 777313152. Its totient is φ = 64705536.

The previous prime is 243733433. The next prime is 243733459. The reversal of 243733440 is 44337342.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 243733398 and 243733407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294307 + ... + 295133.

It is an arithmetic number, because the mean of its divisors is an integer number (6940296).

Almost surely, 2^243733440 is an apocalyptic number.

243733440 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 243733440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388656576).

243733440 is an abundant number, since it is smaller than the sum of its proper divisors (533579712).

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

243733440 is a wasteful number, since it uses less digits than its factorization.

243733440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 30.

The square root of 243733440 is about 15611.9646425426. The cubic root of 243733440 is about 624.6523421169.

The spelling of 243733440 in words is "two hundred forty-three million, seven hundred thirty-three thousand, four hundred forty".