857085009 has 8 divisors (see below), whose sum is σ = 1246669152. Its totient is φ = 519445440.

The previous prime is 857084957. The next prime is 857085037. The reversal of 857085009 is 900580758.

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

It is not a de Polignac number, because 857085009 - 2¹⁶ = 857019473 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (857085049) 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, 12986104 + ... + 12986169.

It is an arithmetic number, because the mean of its divisors is an integer number (155833644).

Almost surely, 2^857085009 is an apocalyptic number.

It is an amenable number.

857085009 is a deficient number, since it is larger than the sum of its proper divisors (389584143).

857085009 is a wasteful number, since it uses less digits than its factorization.

857085009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25972287.

The product of its (nonzero) digits is 100800, while the sum is 42.

The square root of 857085009 is about 29276.0142266669. The cubic root of 857085009 is about 949.8928813663.

The spelling of 857085009 in words is "eight hundred fifty-seven million, eighty-five thousand, nine".