9978912 has 36 divisors (see below), whose sum is σ = 28378350. Its totient is φ = 3326208.

The previous prime is 9978911. The next prime is 9978919. The reversal of 9978912 is 2198799.

It can be written as a sum of positive squares in only one way, i.e., 9511056 + 467856 = 3084^2 + 684^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (9978911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17037 + ... + 17612.

Almost surely, 2^9978912 is an apocalyptic number.

It is an amenable number.

9978912 is an abundant number, since it is smaller than the sum of its proper divisors (18399438).

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

9978912 is a wasteful number, since it uses less digits than its factorization.

9978912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34665 (or 34654 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 9978912 is about 3158.9415949017. The cubic root of 9978912 is about 215.2919200286.

The spelling of 9978912 in words is "nine million, nine hundred seventy-eight thousand, nine hundred twelve".