999000987 has 8 divisors (see below), whose sum is σ = 1338763536. Its totient is φ = 662619552.

The previous prime is 999000967. The next prime is 999000991. The reversal of 999000987 is 789000999.

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

It is not a de Polignac number, because 999000987 - 2²⁴ = 982223771 is a prime.

It is a Smith number, since the sum of its digits (51) 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 (999000967) 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, 844588 + ... + 845769.

It is an arithmetic number, because the mean of its divisors is an integer number (167345442).

Almost surely, 2^999000987 is an apocalyptic number.

999000987 is a deficient number, since it is larger than the sum of its proper divisors (339762549).

999000987 is a wasteful number, since it uses less digits than its factorization.

999000987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690557.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 999000987 is about 31606.9768722034. The cubic root of 999000987 is about 999.6668847132. Note that the first 3 decimals are identical.

The spelling of 999000987 in words is "nine hundred ninety-nine million, nine hundred eighty-seven", and thus it is an aban number.