12312222 has 32 divisors (see below), whose sum is σ = 27675648. Its totient is φ = 3623136.

The previous prime is 12312221. The next prime is 12312227. The reversal of 12312222 is 22221321.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (864864).

Almost surely, 2^12312222 is an apocalyptic number.

12312222 is an abundant number, since it is smaller than the sum of its proper divisors (15363426).

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

12312222 is a wasteful number, since it uses less digits than its factorization.

12312222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904.

The product of its digits is 96, while the sum is 15.

The square root of 12312222 is about 3508.8775983211. The cubic root of 12312222 is about 230.9114557293.

Adding to 12312222 its reverse (22221321), we get a palindrome (34533543).

Subtracting 12312222 from its reverse (22221321), we obtain a palindrome (9909099).

The spelling of 12312222 in words is "twelve million, three hundred twelve thousand, two hundred twenty-two".