990885 has 16 divisors (see below), whose sum is σ = 1812096. Its totient is φ = 452928.

The previous prime is 990881. The next prime is 990887. The reversal of 990885 is 588099.

It is not a de Polignac number, because 990885 - 2² = 990881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4614 + ... + 4823.

It is an arithmetic number, because the mean of its divisors is an integer number (113256).

2⁹⁹⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

990885 is a deficient number, since it is larger than the sum of its proper divisors (821211).

990885 is a wasteful number, since it uses less digits than its factorization.

990885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9452.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 990885 is about 995.4320669940. The cubic root of 990885 is about 99.6952388164.

The spelling of 990885 in words is "nine hundred ninety thousand, eight hundred eighty-five".