990690 has 16 divisors (see below), whose sum is σ = 2377728. Its totient is φ = 264176.

The previous prime is 990673. The next prime is 990707. The reversal of 990690 is 96099.

It is an interprime number because it is at equal distance from previous prime (990673) and next prime (990707).

It is a super-2 number, since 2×990690² = 1962933352200, which contains 22 as substring.

It is an unprimeable number.

990690 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, 16482 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (148608).

2⁹⁹⁰⁶⁹⁰ is an apocalyptic number.

990690 is an abundant number, since it is smaller than the sum of its proper divisors (1387038).

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

990690 is a wasteful number, since it uses less digits than its factorization.

990690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33033.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 990690 is about 995.3341147575. The cubic root of 990690 is about 99.6886985866.

The spelling of 990690 in words is "nine hundred ninety thousand, six hundred ninety".