857657842 has 8 divisors (see below), whose sum is σ = 1327986432. Its totient is φ = 414995700.

The previous prime is 857657831. The next prime is 857657851. The reversal of 857657842 is 248756758.

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

It is a self number, because there is not a number n which added to its sum of digits gives 857657842.

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 in 3 ways as a sum of consecutive naturals, for example, 6916534 + ... + 6916657.

It is an arithmetic number, because the mean of its divisors is an integer number (165998304).

Almost surely, 2^857657842 is an apocalyptic number.

857657842 is a deficient number, since it is larger than the sum of its proper divisors (470328590).

857657842 is a wasteful number, since it uses less digits than its factorization.

857657842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13833224.

The product of its digits is 3763200, while the sum is 52.

The square root of 857657842 is about 29285.7959085971. The cubic root of 857657842 is about 950.1044546272.

The spelling of 857657842 in words is "eight hundred fifty-seven million, six hundred fifty-seven thousand, eight hundred forty-two".