9987944 has 8 divisors (see below), whose sum is σ = 18727410. Its totient is φ = 4993968.

The previous prime is 9987941. The next prime is 9987949. The reversal of 9987944 is 4497899.

It can be written as a sum of positive squares in only one way, i.e., 9672100 + 315844 = 3110^2 + 562^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 9987892 and 9987901.

It is not an unprimeable number, because it can be changed into a prime (9987941) 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 as a sum of consecutive naturals, namely, 624239 + ... + 624254.

Almost surely, 2^9987944 is an apocalyptic number.

It is an amenable number.

9987944 is a deficient number, since it is larger than the sum of its proper divisors (8739466).

9987944 is a wasteful number, since it uses less digits than its factorization.

9987944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248499 (or 1248495 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 9987944 is about 3160.3708643132. The cubic root of 9987944 is about 215.3568546377.

The spelling of 9987944 in words is "nine million, nine hundred eighty-seven thousand, nine hundred forty-four".