9990987 has 8 divisors (see below), whose sum is σ = 13340736. Its totient is φ = 6650952.

The previous prime is 9990961. The next prime is 9990989. The reversal of 9990987 is 7890999.

9990987 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9990987 - 2⁷ = 9990859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468 + ... + 4494.

It is an arithmetic number, because the mean of its divisors is an integer number (1667592).

Almost surely, 2^9990987 is an apocalyptic number.

9990987 is a deficient number, since it is larger than the sum of its proper divisors (3349749).

9990987 is a wasteful number, since it uses less digits than its factorization.

9990987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 9990987 is about 3160.8522584898. The cubic root of 9990987 is about 215.3787231479.

The spelling of 9990987 in words is "nine million, nine hundred ninety thousand, nine hundred eighty-seven".