9878990 has 16 divisors (see below), whose sum is σ = 19398960. Its totient is φ = 3592320.

The previous prime is 9878929. The next prime is 9879007. The reversal of 9878990 is 998789.

It is an Ulam number.

It is a congruent number.

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, 44795 + ... + 45014.

It is an arithmetic number, because the mean of its divisors is an integer number (1212435).

Almost surely, 2^9878990 is an apocalyptic number.

9878990 is a deficient number, since it is larger than the sum of its proper divisors (9519970).

9878990 is a wasteful number, since it uses less digits than its factorization.

9878990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89827.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9878990 is about 3143.0860630915. The cubic root of 9878990 is about 214.5709127403.

The spelling of 9878990 in words is "nine million, eight hundred seventy-eight thousand, nine hundred ninety".