9987765 has 16 divisors (see below), whose sum is σ = 16039296. Its totient is φ = 5307200.

The previous prime is 9987737. The next prime is 9987793. The reversal of 9987765 is 5677899.

9987765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9987737) and next prime (9987793).

It is not a de Polignac number, because 9987765 - 2⁹ = 9987253 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3595 + ... + 5735.

It is an arithmetic number, because the mean of its divisors is an integer number (1002456).

Almost surely, 2^9987765 is an apocalyptic number.

It is an amenable number.

9987765 is a deficient number, since it is larger than the sum of its proper divisors (6051531).

9987765 is a wasteful number, since it uses less digits than its factorization.

9987765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460.

The product of its digits is 952560, while the sum is 51.

The square root of 9987765 is about 3160.3425447252. The cubic root of 9987765 is about 215.3555681164.

The spelling of 9987765 in words is "nine million, nine hundred eighty-seven thousand, seven hundred sixty-five".