990988 has 12 divisors (see below), whose sum is σ = 1794240. Its totient is φ = 478352.

The previous prime is 990973. The next prime is 990989. The reversal of 990988 is 889099.

It is a super-2 number, since 2×990988² = 1964114432288, which contains 22 as substring.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (990989) 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 3 ways as a sum of consecutive naturals, for example, 4156 + ... + 4387.

It is an arithmetic number, because the mean of its divisors is an integer number (149520).

2⁹⁹⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

990988 is a deficient number, since it is larger than the sum of its proper divisors (803252).

990988 is a wasteful number, since it uses less digits than its factorization.

990988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8576 (or 8574 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 990988 is about 995.4838019777. The cubic root of 990988 is about 99.6986930531.

The spelling of 990988 in words is "nine hundred ninety thousand, nine hundred eighty-eight".