12222522 has 64 divisors (see below), whose sum is σ = 30562560. Its totient is φ = 3592512.

The previous prime is 12222521. The next prime is 12222523. The reversal of 12222522 is 22522221.

12222522 is a `hidden beast` number, since 122 + 22 + 522 = 666.

It is an interprime number because it is at equal distance from previous prime (12222521) and next prime (12222523).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12222495 and 12222504.

It is not an unprimeable number, because it can be changed into a prime (12222521) 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, 15768 + ... + 16524.

It is an arithmetic number, because the mean of its divisors is an integer number (477540).

Almost surely, 2^12222522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12222522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15281280).

12222522 is an abundant number, since it is smaller than the sum of its proper divisors (18340038).

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

12222522 is a wasteful number, since it uses less digits than its factorization.

12222522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 798 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 12222522 is about 3496.0723676720. The cubic root of 12222522 is about 230.3493242498.

Adding to 12222522 its reverse (22522221), we get a palindrome (34744743).

The spelling of 12222522 in words is "twelve million, two hundred twenty-two thousand, five hundred twenty-two".