22197812 has 36 divisors (see below), whose sum is σ = 48083616. Its totient is φ = 8779680.

The previous prime is 22197811. The next prime is 22197821. The reversal of 22197812 is 21879122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22197811) 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, 2387 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (1335656).

Almost surely, 2^22197812 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 22197812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24041808).

22197812 is an abundant number, since it is smaller than the sum of its proper divisors (25885804).

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

22197812 is a wasteful number, since it uses less digits than its factorization.

22197812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4728 (or 4713 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 22197812 is about 4711.4554014657. The cubic root of 22197812 is about 281.0412421578.

The spelling of 22197812 in words is "twenty-two million, one hundred ninety-seven thousand, eight hundred twelve".