990583 has 4 divisors (see below), whose sum is σ = 1080648. Its totient is φ = 900520.

The previous prime is 990559. The next prime is 990589. The reversal of 990583 is 385099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45016 + ... + 45037.

It is an arithmetic number, because the mean of its divisors is an integer number (270162).

2⁹⁹⁰⁵⁸³ is an apocalyptic number.

990583 is a deficient number, since it is larger than the sum of its proper divisors (90065).

990583 is a wasteful number, since it uses less digits than its factorization.

990583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90064.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 990583 is about 995.2803625110. The cubic root of 990583 is about 99.6851094804.

The spelling of 990583 in words is "nine hundred ninety thousand, five hundred eighty-three".