857986806 has 8 divisors (see below), whose sum is σ = 1715973624. Its totient is φ = 285995600.

The previous prime is 857986799. The next prime is 857986861. The reversal of 857986806 is 608689758.

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

857986806 is an admirable number.

It is a super-2 number, since 2×857986806² = 1472282718540163272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71498895 + ... + 71498906.

It is an arithmetic number, because the mean of its divisors is an integer number (214496703).

Almost surely, 2^857986806 is an apocalyptic number.

857986806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857986806 is a wasteful number, since it uses less digits than its factorization.

857986806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142997806.

The product of its (nonzero) digits is 5806080, while the sum is 57.

The square root of 857986806 is about 29291.4118130212. The cubic root of 857986806 is about 950.2259134011.

The spelling of 857986806 in words is "eight hundred fifty-seven million, nine hundred eighty-six thousand, eight hundred six".