990888 has 64 divisors (see below), whose sum is σ = 2721600. Its totient is φ = 299520.

The previous prime is 990887. The next prime is 990889. The reversal of 990888 is 888099.

It is an interprime number because it is at equal distance from previous prime (990887) and next prime (990889).

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 15 ways as a sum of consecutive naturals, for example, 18670 + ... + 18722.

It is an arithmetic number, because the mean of its divisors is an integer number (42525).

2⁹⁹⁰⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360800).

990888 is an abundant number, since it is smaller than the sum of its proper divisors (1730712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990888 is a wasteful number, since it uses less digits than its factorization.

990888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 990888 is about 995.4335738762. The cubic root of 990888 is about 99.6953394286.

The spelling of 990888 in words is "nine hundred ninety thousand, eight hundred eighty-eight".