9987144 has 32 divisors (see below), whose sum is σ = 25323840. Its totient is φ = 3281600.

The previous prime is 9987121. The next prime is 9987157. The reversal of 9987144 is 4417899.

It is a junction number, because it is equal to n+sod(n) for n = 9987096 and 9987105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1227 + ... + 4634.

It is an arithmetic number, because the mean of its divisors is an integer number (791370).

Almost surely, 2^9987144 is an apocalyptic number.

It is an amenable number.

9987144 is an abundant number, since it is smaller than the sum of its proper divisors (15336696).

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

9987144 is a wasteful number, since it uses less digits than its factorization.

9987144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941 (or 5937 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 9987144 is about 3160.2442943545. The cubic root of 9987144 is about 215.3511047028.

The spelling of 9987144 in words is "nine million, nine hundred eighty-seven thousand, one hundred forty-four".