8191812 has 72 divisors (see below), whose sum is σ = 21165312. Its totient is φ = 2462400.

The previous prime is 8191811. The next prime is 8191817. The reversal of 8191812 is 2181918.

It is a self number, because there is not a number n which added to its sum of digits gives 8191812.

It is not an unprimeable number, because it can be changed into a prime (8191811) 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, 134262 + ... + 134322.

Almost surely, 2^8191812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8191812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10582656).

8191812 is an abundant number, since it is smaller than the sum of its proper divisors (12973500).

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

8191812 is a wasteful number, since it uses less digits than its factorization.

8191812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 116 counting only the distinct ones).

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

The square root of 8191812 is about 2862.1341687629. The cubic root of 8191812 is about 201.5858258805.

The spelling of 8191812 in words is "eight million, one hundred ninety-one thousand, eight hundred twelve".