990606 has 16 divisors (see below), whose sum is σ = 2001024. Its totient is φ = 326904.

The previous prime is 990599. The next prime is 990631. The reversal of 990606 is 606099.

It is a congruent number.

It is an unprimeable number.

990606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130 + ... + 1413.

It is an arithmetic number, because the mean of its divisors is an integer number (125064).

2⁹⁹⁰⁶⁰⁶ is an apocalyptic number.

990606 is an abundant number, since it is smaller than the sum of its proper divisors (1010418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990606 is a wasteful number, since it uses less digits than its factorization.

990606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 990606 is about 995.2919169771. The cubic root of 990606 is about 99.6858809923.

It can be divided in two parts, 990 and 606, that added together give a triangular number (1596 = T₅₆).

The spelling of 990606 in words is "nine hundred ninety thousand, six hundred six".