990598 has 16 divisors (see below), whose sum is σ = 1712160. Its totient is φ = 421056.

The previous prime is 990593. The next prime is 990599. The reversal of 990598 is 895099.

It is a self number, because there is not a number n which added to its sum of digits gives 990598.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2218 + ... + 2626.

It is an arithmetic number, because the mean of its divisors is an integer number (107010).

2⁹⁹⁰⁵⁹⁸ is an apocalyptic number.

990598 is a deficient number, since it is larger than the sum of its proper divisors (721562).

990598 is a wasteful number, since it uses less digits than its factorization.

990598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 990598 is about 995.2878980476. The cubic root of 990598 is about 99.6856126417.

The spelling of 990598 in words is "nine hundred ninety thousand, five hundred ninety-eight".