243992857 has 8 divisors (see below), whose sum is σ = 258508800. Its totient is φ = 229495104.

The previous prime is 243992767. The next prime is 243992893. The reversal of 243992857 is 758299342.

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

It is not a de Polignac number, because 243992857 - 2⁷ = 243992729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243992857.

It is not an unprimeable number, because it can be changed into a prime (243992057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31144 + ... + 38182.

It is an arithmetic number, because the mean of its divisors is an integer number (32313600).

Almost surely, 2^243992857 is an apocalyptic number.

It is an amenable number.

243992857 is a deficient number, since it is larger than the sum of its proper divisors (14515943).

243992857 is a wasteful number, since it uses less digits than its factorization.

243992857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9095.

The product of its digits is 1088640, while the sum is 49.

The square root of 243992857 is about 15620.2707082816. The cubic root of 243992857 is about 624.8738791914.

The spelling of 243992857 in words is "two hundred forty-three million, nine hundred ninety-two thousand, eight hundred fifty-seven".