12243278 has 16 divisors (see below), whose sum is σ = 19096560. Its totient is φ = 5887000.

The previous prime is 12243251. The next prime is 12243289. The reversal of 12243278 is 87234221.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 12243278.

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 7 ways as a sum of consecutive naturals, for example, 48653 + ... + 48903.

It is an arithmetic number, because the mean of its divisors is an integer number (1193535).

Almost surely, 2^12243278 is an apocalyptic number.

12243278 is a deficient number, since it is larger than the sum of its proper divisors (6853282).

12243278 is an frugal number, since it uses more digits than its factorization.

12243278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 282 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 12243278 is about 3499.0395825140. The cubic root of 12243278 is about 230.4796417823.

Adding to 12243278 its reverse (87234221), we get a palindrome (99477499).

It can be divided in two parts, 12243 and 278, that added together give a palindrome (12521).

The spelling of 12243278 in words is "twelve million, two hundred forty-three thousand, two hundred seventy-eight".