990388 has 36 divisors (see below), whose sum is σ = 2093952. Its totient is φ = 408240.

The previous prime is 990383. The next prime is 990389. The reversal of 990388 is 883099.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990383) 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 11 ways as a sum of consecutive naturals, for example, 5995 + ... + 6157.

2⁹⁹⁰³⁸⁸ is an apocalyptic number.

990388 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046976).

990388 is an abundant number, since it is smaller than the sum of its proper divisors (1103564).

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

990388 is a wasteful number, since it uses less digits than its factorization.

990388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 990388 is about 995.1823953427. The cubic root of 990388 is about 99.6785679212.

It can be divided in two parts, 990 and 388, that added together give a triangular number (1378 = T₅₂).

The spelling of 990388 in words is "nine hundred ninety thousand, three hundred eighty-eight".