990396 has 72 divisors (see below), whose sum is σ = 2843568. Its totient is φ = 288000.

The previous prime is 990389. The next prime is 990397. The reversal of 990396 is 693099.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 990396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990397) by changing a digit.

990396 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 23 ways as a sum of consecutive naturals, for example, 16206 + ... + 16266.

It is an arithmetic number, because the mean of its divisors is an integer number (39494).

2⁹⁹⁰³⁹⁶ 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 990396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421784).

990396 is an abundant number, since it is smaller than the sum of its proper divisors (1853172).

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

990396 is a wasteful number, since it uses less digits than its factorization.

990396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 990396 is about 995.1864146983. The cubic root of 990396 is about 99.6788363097.

It can be divided in two parts, 9903 and 96, that added together give a palindrome (9999).

The spelling of 990396 in words is "nine hundred ninety thousand, three hundred ninety-six".