243640755 has 12 divisors (see below), whose sum is σ = 422310720. Its totient is φ = 129941712.

The previous prime is 243640723. The next prime is 243640799. The reversal of 243640755 is 557046342.

243640755 is a `hidden beast` number, since 2 + 4 + 3 + 640 + 7 + 5 + 5 = 666.

It is not a de Polignac number, because 243640755 - 2⁵ = 243640723 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2707075 + ... + 2707164.

It is an arithmetic number, because the mean of its divisors is an integer number (35192560).

Almost surely, 2^243640755 is an apocalyptic number.

243640755 is a deficient number, since it is larger than the sum of its proper divisors (178669965).

243640755 is a wasteful number, since it uses less digits than its factorization.

243640755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5414250 (or 5414247 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The square root of 243640755 is about 15608.9959638665. The cubic root of 243640755 is about 624.5731528154.

The spelling of 243640755 in words is "two hundred forty-three million, six hundred forty thousand, seven hundred fifty-five".