990618 has 8 divisors (see below), whose sum is σ = 1981248. Its totient is φ = 330204.

The previous prime is 990599. The next prime is 990631. The reversal of 990618 is 816099.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

990618 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

990618 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 3 ways as a sum of consecutive naturals, for example, 82546 + ... + 82557.

It is an arithmetic number, because the mean of its divisors is an integer number (247656).

2⁹⁹⁰⁶¹⁸ is an apocalyptic number.

990618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

990618 is a wasteful number, since it uses less digits than its factorization.

990618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165108.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 990618 is about 995.2979453410. The cubic root of 990618 is about 99.6862835155.

The spelling of 990618 in words is "nine hundred ninety thousand, six hundred eighteen".