858941985 has 32 divisors (see below), whose sum is σ = 1534123008. Its totient is φ = 406768320.

The previous prime is 858941971. The next prime is 858941999. The reversal of 858941985 is 589149858.

It is an interprime number because it is at equal distance from previous prime (858941971) and next prime (858941999).

It is not a de Polignac number, because 858941985 - 2⁶ = 858941921 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53437 + ... + 67626.

It is an arithmetic number, because the mean of its divisors is an integer number (47941344).

Almost surely, 2^858941985 is an apocalyptic number.

It is an amenable number.

858941985 is a deficient number, since it is larger than the sum of its proper divisors (675181023).

858941985 is a wasteful number, since it uses less digits than its factorization.

858941985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121125.

The product of its digits is 4147200, while the sum is 57.

The square root of 858941985 is about 29307.7120396663. The cubic root of 858941985 is about 950.5784049243.

The spelling of 858941985 in words is "eight hundred fifty-eight million, nine hundred forty-one thousand, nine hundred eighty-five".