990287 has 2 divisors, whose sum is σ = 990288. Its totient is φ = 990286.

The previous prime is 990281. The next prime is 990289. The reversal of 990287 is 782099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990287 - 2¹² = 986191 is a prime.

Together with 990289, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is equal to p₇₇₇₉₅ and since 990287 and 77795 have the same sum of digits, it is a Honaker prime.

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 990287.

It is not a weakly prime, because it can be changed into another prime (990281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495143 + 495144.

It is an arithmetic number, because the mean of its divisors is an integer number (495144).

2⁹⁹⁰²⁸⁷ is an apocalyptic number.

990287 is a deficient number, since it is larger than the sum of its proper divisors (1).

990287 is an equidigital number, since it uses as much as digits as its factorization.

990287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 990287 is about 995.1316495821. The cubic root of 990287 is about 99.6751793914.

The spelling of 990287 in words is "nine hundred ninety thousand, two hundred eighty-seven".