990285 has 16 divisors (see below), whose sum is σ = 1601856. Its totient is φ = 522368.

The previous prime is 990281. The next prime is 990287. The reversal of 990285 is 582099.

990285 = T₇₉ + T₈₀ + ... + T₁₈₅.

It is a cyclic number.

It is not a de Polignac number, because 990285 - 2² = 990281 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990285.

It is not an unprimeable number, because it can be changed into a prime (990281) 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 15 ways as a sum of consecutive naturals, for example, 1297 + ... + 1913.

It is an arithmetic number, because the mean of its divisors is an integer number (100116).

2⁹⁹⁰²⁸⁵ is an apocalyptic number.

It is an amenable number.

990285 is a deficient number, since it is larger than the sum of its proper divisors (611571).

990285 is a wasteful number, since it uses less digits than its factorization.

990285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 990285 is about 995.1306446894. The cubic root of 990285 is about 99.6751122895.

It can be divided in two parts, 990 and 285, that added together give a triangular number (1275 = T₅₀).

The spelling of 990285 in words is "nine hundred ninety thousand, two hundred eighty-five".