243738840 has 64 divisors (see below), whose sum is σ = 769708800. Its totient is φ = 61575552.

The previous prime is 243738839. The next prime is 243738883. The reversal of 243738840 is 48837342.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51172 + ... + 55731.

It is an arithmetic number, because the mean of its divisors is an integer number (12026700).

Almost surely, 2^243738840 is an apocalyptic number.

243738840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243738840 is an abundant number, since it is smaller than the sum of its proper divisors (525969960).

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

243738840 is a wasteful number, since it uses less digits than its factorization.

243738840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106936 (or 106932 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 243738840 is about 15612.1375858657. The cubic root of 243738840 is about 624.6569552136.

The spelling of 243738840 in words is "two hundred forty-three million, seven hundred thirty-eight thousand, eight hundred forty".