990822 has 32 divisors (see below), whose sum is σ = 2340864. Its totient is φ = 273600.

The previous prime is 990809. The next prime is 990841. The reversal of 990822 is 228099.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 990822.

It is a congruent number.

It is an unprimeable number.

990822 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 922 + ... + 1682.

It is an arithmetic number, because the mean of its divisors is an integer number (73152).

2⁹⁹⁰⁸²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170432).

990822 is an abundant number, since it is smaller than the sum of its proper divisors (1350042).

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

990822 is a wasteful number, since it uses less digits than its factorization.

990822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 990822 is about 995.4004219408. The cubic root of 990822 is about 99.6931259129.

The spelling of 990822 in words is "nine hundred ninety thousand, eight hundred twenty-two".