9909887 has 16 divisors (see below), whose sum is σ = 11460960. Its totient is φ = 8491392.

The previous prime is 9909881. The next prime is 9909901. The reversal of 9909887 is 7889099.

It is not a de Polignac number, because 9909887 - 2⁴ = 9909871 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 (9909881) 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, 12713 + ... + 13469.

It is an arithmetic number, because the mean of its divisors is an integer number (716310).

Almost surely, 2^9909887 is an apocalyptic number.

9909887 is a deficient number, since it is larger than the sum of its proper divisors (1551073).

9909887 is a wasteful number, since it uses less digits than its factorization.

9909887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9909887 is about 3147.9972998718. The cubic root of 9909887 is about 214.7943734388.

The spelling of 9909887 in words is "nine million, nine hundred nine thousand, eight hundred eighty-seven".