9723978 has 48 divisors (see below), whose sum is σ = 23358816. Its totient is φ = 2898720.

The previous prime is 9723943. The next prime is 9723979. The reversal of 9723978 is 8793279.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9723979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12900 + ... + 13632.

It is an arithmetic number, because the mean of its divisors is an integer number (486642).

Almost surely, 2^9723978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9723978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11679408).

9723978 is an abundant number, since it is smaller than the sum of its proper divisors (13634838).

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

9723978 is a wasteful number, since it uses less digits than its factorization.

9723978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 816 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 9723978 is about 3118.3293604108. The cubic root of 9723978 is about 213.4427081290.

It can be divided in two parts, 9723 and 978, that added together give a palindrome (10701).

The spelling of 9723978 in words is "nine million, seven hundred twenty-three thousand, nine hundred seventy-eight".