9987505 has 16 divisors (see below), whose sum is σ = 13198464. Its totient is φ = 7194880.

The previous prime is 9987503. The next prime is 9987511. The reversal of 9987505 is 5057899.

9987505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9987505 - 2¹ = 9987503 is a prime.

It is a super-2 number, since 2×9987505² = 199500512250050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9987503) 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 15 ways as a sum of consecutive naturals, for example, 5412 + ... + 7018.

It is an arithmetic number, because the mean of its divisors is an integer number (824904).

Almost surely, 2^9987505 is an apocalyptic number.

It is an amenable number.

9987505 is a deficient number, since it is larger than the sum of its proper divisors (3210959).

9987505 is a wasteful number, since it uses less digits than its factorization.

9987505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736.

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 9987505 is about 3160.3014096760. The cubic root of 9987505 is about 215.3536993989.

The spelling of 9987505 in words is "nine million, nine hundred eighty-seven thousand, five hundred five".