990884 has 24 divisors (see below), whose sum is σ = 1833216. Its totient is φ = 468000.

The previous prime is 990881. The next prime is 990887. The reversal of 990884 is 488099.

It is an interprime number because it is at equal distance from previous prime (990881) and next prime (990887).

It is a super-2 number, since 2×990884² = 1963702202912, which contains 22 as substring.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (990881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7499 + ... + 7629.

It is an arithmetic number, because the mean of its divisors is an integer number (76384).

2⁹⁹⁰⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

990884 is a deficient number, since it is larger than the sum of its proper divisors (842332).

990884 is a wasteful number, since it uses less digits than its factorization.

990884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 990884 is about 995.4315646995. The cubic root of 990884 is about 99.6952052790.

The spelling of 990884 in words is "nine hundred ninety thousand, eight hundred eighty-four".