9978836 has 12 divisors (see below), whose sum is σ = 19957728. Its totient is φ = 4276632.

The previous prime is 9978833. The next prime is 9978877. The reversal of 9978836 is 6388799.

9978836 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978833) 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, 178166 + ... + 178221.

It is an arithmetic number, because the mean of its divisors is an integer number (1663144).

Almost surely, 2^9978836 is an apocalyptic number.

It is an amenable number.

9978836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9978836 is a wasteful number, since it uses less digits than its factorization.

9978836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356398 (or 356396 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 9978836 is about 3158.9295655332. The cubic root of 9978836 is about 215.2913734684.

The spelling of 9978836 in words is "nine million, nine hundred seventy-eight thousand, eight hundred thirty-six".