999000889 has 4 divisors (see below), whose sum is σ = 1000391040. Its totient is φ = 997610740.

The previous prime is 999000841. The next prime is 999000901. The reversal of 999000889 is 988000999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988000999 = 1321 ⋅747919.

It is a cyclic number.

It is not a de Polignac number, because 999000889 - 2²¹ = 996903737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999000809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693997 + ... + 695434.

It is an arithmetic number, because the mean of its divisors is an integer number (250097760).

Almost surely, 2^999000889 is an apocalyptic number.

It is an amenable number.

999000889 is a deficient number, since it is larger than the sum of its proper divisors (1390151).

999000889 is a wasteful number, since it uses less digits than its factorization.

999000889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390150.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 999000889 is about 31606.9753219127. The cubic root of 999000889 is about 999.6668520248. Note that the first 3 decimals are identical.

The spelling of 999000889 in words is "nine hundred ninety-nine million, eight hundred eighty-nine", and thus it is an aban number.