9987945 has 24 divisors (see below), whose sum is σ = 17568768. Its totient is φ = 4841760.

The previous prime is 9987941. The next prime is 9987949. The reversal of 9987945 is 5497899.

It is a happy number.

9987945 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 (9987941) and next prime (9987949).

It is not a de Polignac number, because 9987945 - 2² = 9987941 is a prime.

9987945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9987941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 937 + ... + 4566.

It is an arithmetic number, because the mean of its divisors is an integer number (732032).

Almost surely, 2^9987945 is an apocalyptic number.

It is an amenable number.

9987945 is a deficient number, since it is larger than the sum of its proper divisors (7580823).

9987945 is a wasteful number, since it uses less digits than its factorization.

9987945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533 (or 5522 counting only the distinct ones).

The product of its digits is 816480, while the sum is 51.

The square root of 9987945 is about 3160.3710225225. The cubic root of 9987945 is about 215.3568618249.

The spelling of 9987945 in words is "nine million, nine hundred eighty-seven thousand, nine hundred forty-five".