990669 has 16 divisors (see below), whose sum is σ = 1396800. Its totient is φ = 623616.

The previous prime is 990643. The next prime is 990673. The reversal of 990669 is 966099.

It is not a de Polignac number, because 990669 - 2⁵ = 990637 is a prime.

It is a super-2 number, since 2×990669² = 1962850135122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5037 + ... + 5229.

It is an arithmetic number, because the mean of its divisors is an integer number (87300).

2⁹⁹⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

990669 is a deficient number, since it is larger than the sum of its proper divisors (406131).

990669 is a wasteful number, since it uses less digits than its factorization.

990669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 990669 is about 995.3235654801. The cubic root of 990669 is about 99.6879942029.

The spelling of 990669 in words is "nine hundred ninety thousand, six hundred sixty-nine".