857686742 has 16 divisors (see below), whose sum is σ = 1403961552. Its totient is φ = 389725920.

The previous prime is 857686727. The next prime is 857686759. The reversal of 857686742 is 247686758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94508 + ... + 103184.

It is an arithmetic number, because the mean of its divisors is an integer number (87747597).

Almost surely, 2^857686742 is an apocalyptic number.

857686742 is a deficient number, since it is larger than the sum of its proper divisors (546274810).

857686742 is a wasteful number, since it uses less digits than its factorization.

857686742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13183.

The product of its digits is 4515840, while the sum is 53.

The square root of 857686742 is about 29286.2893176995. The cubic root of 857686742 is about 950.1151262140.

The spelling of 857686742 in words is "eight hundred fifty-seven million, six hundred eighty-six thousand, seven hundred forty-two".