9987444 has 18 divisors (see below), whose sum is σ = 25246130. Its totient is φ = 3329136.

The previous prime is 9987443. The next prime is 9987457. The reversal of 9987444 is 4447899.

It can be written as a sum of positive squares in only one way, i.e., 5702544 + 4284900 = 2388^2 + 2070^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9987444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987443) 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 5 ways as a sum of consecutive naturals, for example, 138679 + ... + 138750.

Almost surely, 2^9987444 is an apocalyptic number.

It is an amenable number.

9987444 is an abundant number, since it is smaller than the sum of its proper divisors (15258686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9987444 is a wasteful number, since it uses less digits than its factorization.

9987444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277439 (or 277434 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 9987444 is about 3160.2917586830. The cubic root of 9987444 is about 215.3532609643.

The spelling of 9987444 in words is "nine million, nine hundred eighty-seven thousand, four hundred forty-four".