990845 has 8 divisors (see below), whose sum is σ = 1259064. Its totient is φ = 745984.

The previous prime is 990841. The next prime is 990851. The reversal of 990845 is 548099.

It can be written as a sum of positive squares in 4 ways, for example, as 306916 + 683929 = 554^2 + 827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990845 - 2² = 990841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990845.

It is not an unprimeable number, because it can be changed into a prime (990841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5744 + ... + 5913.

It is an arithmetic number, because the mean of its divisors is an integer number (157383).

2⁹⁹⁰⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

990845 is a deficient number, since it is larger than the sum of its proper divisors (268219).

990845 is a wasteful number, since it uses less digits than its factorization.

990845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11679.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 990845 is about 995.4119750134. The cubic root of 990845 is about 99.6938973008.

The spelling of 990845 in words is "nine hundred ninety thousand, eight hundred forty-five".