243388416 has 104 divisors (see below), whose sum is σ = 672317280. Its totient is φ = 78217216.

The previous prime is 243388381. The next prime is 243388417. The reversal of 243388416 is 614883342.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243388417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356011 + ... + 356693.

Almost surely, 2^243388416 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 243388416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336158640).

243388416 is an abundant number, since it is smaller than the sum of its proper divisors (428928864).

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

243388416 is an equidigital number, since it uses as much as digits as its factorization.

243388416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 717 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 243388416 is about 15600.9107426458. The cubic root of 243388416 is about 624.3574546298.

The spelling of 243388416 in words is "two hundred forty-three million, three hundred eighty-eight thousand, four hundred sixteen".