243843940 has 12 divisors (see below), whose sum is σ = 512072316. Its totient is φ = 97537568.

The previous prime is 243843917. The next prime is 243843959. The reversal of 243843940 is 49348342.

243843940 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 146071396 + 97772544 = 12086^2 + 9888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243843940.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6096079 + ... + 6096118.

It is an arithmetic number, because the mean of its divisors is an integer number (42672693).

Almost surely, 2^243843940 is an apocalyptic number.

243843940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243843940 is an abundant number, since it is smaller than the sum of its proper divisors (268228376).

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

243843940 is a wasteful number, since it uses less digits than its factorization.

243843940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12192206 (or 12192204 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 243843940 is about 15615.5031939416. The cubic root of 243843940 is about 624.7467261777.

The spelling of 243843940 in words is "two hundred forty-three million, eight hundred forty-three thousand, nine hundred forty".