857591242 has 4 divisors (see below), whose sum is σ = 1286386866. Its totient is φ = 428795620.

The previous prime is 857591237. The next prime is 857591279. The reversal of 857591242 is 242195758.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 441798361 + 415792881 = 21019^2 + 20391^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214397809 + ... + 214397812.

Almost surely, 2^857591242 is an apocalyptic number.

857591242 is a deficient number, since it is larger than the sum of its proper divisors (428795624).

857591242 is a wasteful number, since it uses less digits than its factorization.

857591242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428795623.

The product of its digits is 201600, while the sum is 43.

The square root of 857591242 is about 29284.6588165203. The cubic root of 857591242 is about 950.0798610610.

The spelling of 857591242 in words is "eight hundred fifty-seven million, five hundred ninety-one thousand, two hundred forty-two".