857084042 has 8 divisors (see below), whose sum is σ = 1286700132. Its totient is φ = 428184000.

The previous prime is 857084027. The next prime is 857084047. The reversal of 857084042 is 240480758.

It can be written as a sum of positive squares in 2 ways, for example, as 640140601 + 216943441 = 25301^2 + 14729^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 857083987 and 857084005.

It is not an unprimeable number, because it can be changed into a prime (857084047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176009 + ... + 180812.

Almost surely, 2^857084042 is an apocalyptic number.

857084042 is a deficient number, since it is larger than the sum of its proper divisors (429616090).

857084042 is a wasteful number, since it uses less digits than its factorization.

857084042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358024.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 857084042 is about 29275.9977114359. The cubic root of 857084042 is about 949.8925241295.

The spelling of 857084042 in words is "eight hundred fifty-seven million, eighty-four thousand, forty-two".