9873978 has 16 divisors (see below), whose sum is σ = 20429280. Its totient is φ = 3177776.

The previous prime is 9873971. The next prime is 9873979. The reversal of 9873978 is 8793789.

It is a happy number.

9873978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×9873978⁴ (a number of 29 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9873978.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9873971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28200 + ... + 28547.

It is an arithmetic number, because the mean of its divisors is an integer number (1276830).

Almost surely, 2^9873978 is an apocalyptic number.

9873978 is an abundant number, since it is smaller than the sum of its proper divisors (10555302).

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

9873978 is a wasteful number, since it uses less digits than its factorization.

9873978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56781.

The product of its digits is 762048, while the sum is 51.

The square root of 9873978 is about 3142.2886563777. The cubic root of 9873978 is about 214.5346198489.

The spelling of 9873978 in words is "nine million, eight hundred seventy-three thousand, nine hundred seventy-eight".