857706842 has 16 divisors (see below), whose sum is σ = 1366898760. Its totient is φ = 402873408.

The previous prime is 857706841. The next prime is 857706859. The reversal of 857706842 is 248607758.

It can be written as a sum of positive squares in 4 ways, for example, as 725709721 + 131997121 = 26939^2 + 11489^2 .

It is a super-2 number, since 2×857706842² = 1471322053627225928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (857706841) 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, 197693 + ... + 201984.

Almost surely, 2^857706842 is an apocalyptic number.

857706842 is a deficient number, since it is larger than the sum of its proper divisors (509191918).

857706842 is a wasteful number, since it uses less digits than its factorization.

857706842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399745.

The product of its (nonzero) digits is 752640, while the sum is 47.

The square root of 857706842 is about 29286.6324796826. The cubic root of 857706842 is about 950.1225481798.

The spelling of 857706842 in words is "eight hundred fifty-seven million, seven hundred six thousand, eight hundred forty-two".