9878987 has 4 divisors (see below), whose sum is σ = 10197696. Its totient is φ = 9560280.

The previous prime is 9878929. The next prime is 9879007. The reversal of 9878987 is 7898789.

9878987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9878987 - 2⁶ = 9878923 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159308 + ... + 159369.

It is an arithmetic number, because the mean of its divisors is an integer number (2549424).

Almost surely, 2^9878987 is an apocalyptic number.

9878987 is a deficient number, since it is larger than the sum of its proper divisors (318709).

9878987 is a wasteful number, since it uses less digits than its factorization.

9878987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318708.

The product of its digits is 2032128, while the sum is 56.

The square root of 9878987 is about 3143.0855858535. The cubic root of 9878987 is about 214.5708910204.

The spelling of 9878987 in words is "nine million, eight hundred seventy-eight thousand, nine hundred eighty-seven".