243943780 has 12 divisors (see below), whose sum is σ = 512281980. Its totient is φ = 97577504.

The previous prime is 243943757. The next prime is 243943781. The reversal of 243943780 is 87349342.

243943780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 47775744 + 196168036 = 6912^2 + 14006^2 .

It is not an unprimeable number, because it can be changed into a prime (243943781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6098575 + ... + 6098614.

It is an arithmetic number, because the mean of its divisors is an integer number (42690165).

Almost surely, 2^243943780 is an apocalyptic number.

243943780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243943780 is an abundant number, since it is smaller than the sum of its proper divisors (268338200).

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

243943780 is a wasteful number, since it uses less digits than its factorization.

243943780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12197198 (or 12197196 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 243943780 is about 15618.6996897949. The cubic root of 243943780 is about 624.8319804351.

The spelling of 243943780 in words is "two hundred forty-three million, nine hundred forty-three thousand, seven hundred eighty".