243907855 has 8 divisors (see below), whose sum is σ = 298212192. Its totient is φ = 191444448.

The previous prime is 243907843. The next prime is 243907871. The reversal of 243907855 is 558709342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243907855 - 2⁹ = 243907343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459939 + ... + 460468.

It is an arithmetic number, because the mean of its divisors is an integer number (37276524).

Almost surely, 2^243907855 is an apocalyptic number.

243907855 is a deficient number, since it is larger than the sum of its proper divisors (54304337).

243907855 is an equidigital number, since it uses as much as digits as its factorization.

243907855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920465.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 243907855 is about 15617.5495837215. The cubic root of 243907855 is about 624.8013064401.

The spelling of 243907855 in words is "two hundred forty-three million, nine hundred seven thousand, eight hundred fifty-five".