9990287 has 4 divisors (see below), whose sum is σ = 10000536. Its totient is φ = 9980040.

The previous prime is 9990283. The next prime is 9990289. The reversal of 9990287 is 7820999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9990287 - 2² = 9990283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990283) 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 3 ways as a sum of consecutive naturals, for example, 3488 + ... + 5669.

It is an arithmetic number, because the mean of its divisors is an integer number (2500134).

Almost surely, 2^9990287 is an apocalyptic number.

9990287 is a deficient number, since it is larger than the sum of its proper divisors (10249).

9990287 is a wasteful number, since it uses less digits than its factorization.

9990287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10248.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 9990287 is about 3160.7415269205. The cubic root of 9990287 is about 215.3736929933.

The spelling of 9990287 in words is "nine million, nine hundred ninety thousand, two hundred eighty-seven".