9887931 has 12 divisors (see below), whose sum is σ = 15122952. Its totient is φ = 6204096.

The previous prime is 9887921. The next prime is 9887939. The reversal of 9887931 is 1397889.

It is not a de Polignac number, because 9887931 - 2¹⁸ = 9625787 is a prime.

It is a super-2 number, since 2×9887931² = 195542358921522, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (9887939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32161 + ... + 32466.

It is an arithmetic number, because the mean of its divisors is an integer number (1260246).

Almost surely, 2^9887931 is an apocalyptic number.

9887931 is a deficient number, since it is larger than the sum of its proper divisors (5235021).

9887931 is a wasteful number, since it uses less digits than its factorization.

9887931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64650 (or 64647 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9887931 is about 3144.5080696351. The cubic root of 9887931 is about 214.6356258350.

The spelling of 9887931 in words is "nine million, eight hundred eighty-seven thousand, nine hundred thirty-one".