12378222 has 12 divisors (see below), whose sum is σ = 26819520. Its totient is φ = 4126068.

The previous prime is 12378199. The next prime is 12378241. The reversal of 12378222 is 22287321.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 343822 + ... + 343857.

It is an arithmetic number, because the mean of its divisors is an integer number (2234960).

Almost surely, 2^12378222 is an apocalyptic number.

12378222 is an abundant number, since it is smaller than the sum of its proper divisors (14441298).

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

12378222 is a wasteful number, since it uses less digits than its factorization.

12378222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687687 (or 687684 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 12378222 is about 3518.2697452015. The cubic root of 12378222 is about 231.3233230356.

Subtracting 12378222 from its reverse (22287321), we obtain a palindrome (9909099).

The spelling of 12378222 in words is "twelve million, three hundred seventy-eight thousand, two hundred twenty-two".