9887654321 has 16 divisors (see below), whose sum is σ = 10751139840. Its totient is φ = 9058890960.

The previous prime is 9887654317. The next prime is 9887654339. The reversal of 9887654321 is 1234567889.

It is a cyclic number.

It is not a de Polignac number, because 9887654321 - 2² = 9887654317 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9887654351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1009976 + ... + 1019718.

It is an arithmetic number, because the mean of its divisors is an integer number (671946240).

Almost surely, 2^9887654321 is an apocalyptic number.

It is an amenable number.

9887654321 is a deficient number, since it is larger than the sum of its proper divisors (863485519).

9887654321 is a wasteful number, since it uses less digits than its factorization.

9887654321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11516.

The product of its digits is 2903040, while the sum is 53.

The square root of 9887654321 is about 99436.6849859749. The cubic root of 9887654321 is about 2146.3362387514.

The spelling of 9887654321 in words is "nine billion, eight hundred eighty-seven million, six hundred fifty-four thousand, three hundred twenty-one".