9978318 has 24 divisors (see below), whose sum is σ = 24708528. Its totient is φ = 2850912.

The previous prime is 9978313. The next prime is 9978323. The reversal of 9978318 is 8138799.

It is an interprime number because it is at equal distance from previous prime (9978313) and next prime (9978323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39471 + ... + 39722.

It is an arithmetic number, because the mean of its divisors is an integer number (1029522).

Almost surely, 2^9978318 is an apocalyptic number.

9978318 is an abundant number, since it is smaller than the sum of its proper divisors (14730210).

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

9978318 is a wasteful number, since it uses less digits than its factorization.

9978318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79208 (or 79205 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9978318 is about 3158.8475746702. The cubic root of 9978318 is about 215.2876481554.

It can be divided in two parts, 9978 and 318, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 9978318 in words is "nine million, nine hundred seventy-eight thousand, three hundred eighteen".