990590 has 16 divisors (see below), whose sum is σ = 1888272. Its totient is φ = 372864.

The previous prime is 990589. The next prime is 990593. The reversal of 990590 is 95099.

It is an Ulam 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 990590.

It is not an unprimeable number, because it can be changed into a prime (990593) 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, 2744 + ... + 3083.

It is an arithmetic number, because the mean of its divisors is an integer number (118017).

2⁹⁹⁰⁵⁹⁰ is an apocalyptic number.

990590 is a deficient number, since it is larger than the sum of its proper divisors (897682).

990590 is a wasteful number, since it uses less digits than its factorization.

990590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 990590 is about 995.2838791018. The cubic root of 990590 is about 99.6853442896.

The spelling of 990590 in words is "nine hundred ninety thousand, five hundred ninety".