9978856 has 16 divisors (see below), whose sum is σ = 18757440. Its totient is φ = 4976880.

The previous prime is 9978833. The next prime is 9978877. The reversal of 9978856 is 6588799.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2401 + ... + 5071.

It is an arithmetic number, because the mean of its divisors is an integer number (1172340).

Almost surely, 2^9978856 is an apocalyptic number.

It is an amenable number.

9978856 is a deficient number, since it is larger than the sum of its proper divisors (8778584).

9978856 is a wasteful number, since it uses less digits than its factorization.

9978856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144 (or 3140 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The square root of 9978856 is about 3158.9327311610. The cubic root of 9978856 is about 215.2915173003.

The spelling of 9978856 in words is "nine million, nine hundred seventy-eight thousand, eight hundred fifty-six".