9987669 has 24 divisors (see below), whose sum is σ = 15027480. Its totient is φ = 6386688.

The previous prime is 9987643. The next prime is 9987671. The reversal of 9987669 is 9667899.

It can be written as a sum of positive squares in 4 ways, for example, as 1077444 + 8910225 = 1038^2 + 2985^2 .

It is not a de Polignac number, because 9987669 - 2⁸ = 9987413 is a prime.

It is a super-2 number, since 2×9987669² = 199507064107122, which contains 22 as substring.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987569) 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 23 ways as a sum of consecutive naturals, for example, 29469 + ... + 29805.

It is an arithmetic number, because the mean of its divisors is an integer number (626145).

Almost surely, 2^9987669 is an apocalyptic number.

It is an amenable number.

9987669 is a deficient number, since it is larger than the sum of its proper divisors (5039811).

9987669 is a wasteful number, since it uses less digits than its factorization.

9987669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 466 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 9987669 is about 3160.3273564617. The cubic root of 9987669 is about 215.3548781322.

The spelling of 9987669 in words is "nine million, nine hundred eighty-seven thousand, six hundred sixty-nine".