243123340 has 36 divisors (see below), whose sum is σ = 533491056. Its totient is φ = 92893152.

The previous prime is 243123329. The next prime is 243123343. The reversal of 243123340 is 43321342.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (243123343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 334057 + ... + 334783.

It is an arithmetic number, because the mean of its divisors is an integer number (14819196).

Almost surely, 2^243123340 is an apocalyptic number.

243123340 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 243123340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266745528).

243123340 is an abundant number, since it is smaller than the sum of its proper divisors (290367716).

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

243123340 is an equidigital number, since it uses as much as digits as its factorization.

243123340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 243123340 is about 15592.4128985863. The cubic root of 243123340 is about 624.1307082916.

Adding to 243123340 its reverse (43321342), we get a palindrome (286444682).

The spelling of 243123340 in words is "two hundred forty-three million, one hundred twenty-three thousand, three hundred forty".