999806889 has 32 divisors (see below), whose sum is σ = 1407504384. Its totient is φ = 630604800.

The previous prime is 999806887. The next prime is 999806911. The reversal of 999806889 is 988608999.

It is not a de Polignac number, because 999806889 - 2¹ = 999806887 is a prime.

It is a super-2 number, since 2×999806889² = 1999227630583716642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999806887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 623689 + ... + 625289.

It is an arithmetic number, because the mean of its divisors is an integer number (43984512).

Almost surely, 2^999806889 is an apocalyptic number.

It is an amenable number.

999806889 is a deficient number, since it is larger than the sum of its proper divisors (407697495).

999806889 is a wasteful number, since it uses less digits than its factorization.

999806889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797.

The product of its (nonzero) digits is 20155392, while the sum is 66.

The square root of 999806889 is about 31619.7231012544. The cubic root of 999806889 is about 999.9356255227.

The spelling of 999806889 in words is "nine hundred ninety-nine million, eight hundred six thousand, eight hundred eighty-nine".