8991318 has 32 divisors (see below), whose sum is σ = 20772864. Its totient is φ = 2541312.

The previous prime is 8991299. The next prime is 8991319. The reversal of 8991318 is 8131998.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2971 + ... + 5177.

It is an arithmetic number, because the mean of its divisors is an integer number (649152).

Almost surely, 2^8991318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8991318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10386432).

8991318 is an abundant number, since it is smaller than the sum of its proper divisors (11781546).

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

8991318 is a wasteful number, since it uses less digits than its factorization.

8991318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316.

The product of its digits is 15552, while the sum is 39.

The square root of 8991318 is about 2998.5526508634. The cubic root of 8991318 is about 207.9414745351.

The spelling of 8991318 in words is "eight million, nine hundred ninety-one thousand, three hundred eighteen".