243405320 has 128 divisors (see below), whose sum is σ = 615859200. Its totient is φ = 86102016.

The previous prime is 243405313. The next prime is 243405347. The reversal of 243405320 is 23504342.

It is a super-2 number, since 2×243405320² = 118492299608604800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1235462 + ... + 1235658.

It is an arithmetic number, because the mean of its divisors is an integer number (4811400).

Almost surely, 2^243405320 is an apocalyptic number.

243405320 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 243405320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307929600).

243405320 is an abundant number, since it is smaller than the sum of its proper divisors (372453880).

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

243405320 is a wasteful number, since it uses less digits than its factorization.

243405320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 243405320 is about 15601.4524964825. The cubic root of 243405320 is about 624.3719087470.

Adding to 243405320 its reverse (23504342), we get a palindrome (266909662).

The spelling of 243405320 in words is "two hundred forty-three million, four hundred five thousand, three hundred twenty".