9987399 has 12 divisors (see below), whose sum is σ = 14508312. Its totient is φ = 6620400.

The previous prime is 9987391. The next prime is 9987403. The reversal of 9987399 is 9937899.

It is a happy number.

It is not a de Polignac number, because 9987399 - 2³ = 9987391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987391) 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 11 ways as a sum of consecutive naturals, for example, 1437 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (1209026).

Almost surely, 2^9987399 is an apocalyptic number.

9987399 is a deficient number, since it is larger than the sum of its proper divisors (4520913).

9987399 is a wasteful number, since it uses less digits than its factorization.

9987399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6318 (or 6315 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 9987399 is about 3160.2846390792. The cubic root of 9987399 is about 215.3529375279.

The spelling of 9987399 in words is "nine million, nine hundred eighty-seven thousand, three hundred ninety-nine".