8211918 has 64 divisors (see below), whose sum is σ = 20466432. Its totient is φ = 2158080.

The previous prime is 8211899. The next prime is 8211919. The reversal of 8211918 is 8191128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8211919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14305 + ... + 14867.

It is an arithmetic number, because the mean of its divisors is an integer number (319788).

Almost surely, 2^8211918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8211918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10233216).

8211918 is an abundant number, since it is smaller than the sum of its proper divisors (12254514).

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

8211918 is a wasteful number, since it uses less digits than its factorization.

8211918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609.

The product of its digits is 1152, while the sum is 30.

The square root of 8211918 is about 2865.6444301413. The cubic root of 8211918 is about 201.7506153542.

The spelling of 8211918 in words is "eight million, two hundred eleven thousand, nine hundred eighteen".