990445 has 8 divisors (see below), whose sum is σ = 1199736. Its totient is φ = 784896.

The previous prime is 990397. The next prime is 990463. The reversal of 990445 is 544099.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 896809 = 306^2 + 947^2 .

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 990445 - 2¹⁷ = 859373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 312 + ... + 1441.

It is an arithmetic number, because the mean of its divisors is an integer number (149967).

2⁹⁹⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

990445 is a deficient number, since it is larger than the sum of its proper divisors (209291).

990445 is a wasteful number, since it uses less digits than its factorization.

990445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 990445 is about 995.2110328970. The cubic root of 990445 is about 99.6804801581.

The spelling of 990445 in words is "nine hundred ninety thousand, four hundred forty-five".