243440000 has 160 divisors (see below), whose sum is σ = 645262200. Its totient is φ = 91136000.

The previous prime is 243439969. The next prime is 243440033. The reversal of 243440000 is 44342.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1359911 + ... + 1360089.

Almost surely, 2^243440000 is an apocalyptic number.

243440000 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 243440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322631100).

243440000 is an abundant number, since it is smaller than the sum of its proper divisors (401822200).

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

243440000 is an equidigital number, since it uses as much as digits as its factorization.

243440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 243440000 is about 15602.5638918737. The cubic root of 243440000 is about 624.4015605085.

Adding to 243440000 its reverse (44342), we get a palindrome (243484342).

The spelling of 243440000 in words is "two hundred forty-three million, four hundred forty thousand".