858999999 has 16 divisors (see below), whose sum is σ = 1345567104. Its totient is φ = 480559200.

The previous prime is 858999997. The next prime is 859000073. The reversal of 858999999 is 999999858.

It is not a de Polignac number, because 858999999 - 2¹ = 858999997 is a prime.

858999999 is a modest number, since divided by 99999 gives 8589 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 858999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858999997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1000737 + ... + 1001594.

It is an arithmetic number, because the mean of its divisors is an integer number (84097944).

Almost surely, 2^858999999 is an apocalyptic number.

858999999 is a deficient number, since it is larger than the sum of its proper divisors (486567105).

858999999 is a wasteful number, since it uses less digits than its factorization.

858999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002358.

The product of its digits is 170061120, while the sum is 75.

The square root of 858999999 is about 29308.7017624459. The cubic root of 858999999 is about 950.5998055214.

The spelling of 858999999 in words is "eight hundred fifty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".