9987705 has 80 divisors (see below), whose sum is σ = 22116864. Its totient is φ = 4199040.

The previous prime is 9987671. The next prime is 9987709. The reversal of 9987705 is 5077899.

9987705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9987705 - 2⁷ = 9987577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9987709) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 36720 + ... + 36990.

Almost surely, 2^9987705 is an apocalyptic number.

It is an amenable number.

9987705 is an abundant number, since it is smaller than the sum of its proper divisors (12129159).

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

9987705 is a wasteful number, since it uses less digits than its factorization.

9987705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 9987705 is about 3160.3330520690. Note that the first 3 decimals coincide. The cubic root of 9987705 is about 215.3551368768.

The spelling of 9987705 in words is "nine million, nine hundred eighty-seven thousand, seven hundred five".