9987549 has 32 divisors (see below), whose sum is σ = 16171008. Its totient is φ = 5400000.

The previous prime is 9987539. The next prime is 9987553. The reversal of 9987549 is 9457899.

It is a happy number.

It is not a de Polignac number, because 9987549 - 2⁴ = 9987533 is a prime.

It is a super-2 number, since 2×9987549² = 199502270054802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987539) 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 31 ways as a sum of consecutive naturals, for example, 12924 + ... + 13674.

It is an arithmetic number, because the mean of its divisors is an integer number (505344).

Almost surely, 2^9987549 is an apocalyptic number.

It is an amenable number.

9987549 is a deficient number, since it is larger than the sum of its proper divisors (6183459).

9987549 is a wasteful number, since it uses less digits than its factorization.

9987549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809.

The product of its digits is 816480, while the sum is 51.

The square root of 9987549 is about 3160.3083710296. The cubic root of 9987549 is about 215.3540156457.

The spelling of 9987549 in words is "nine million, nine hundred eighty-seven thousand, five hundred forty-nine".