12231278 has 4 divisors (see below), whose sum is σ = 18346920. Its totient is φ = 6115638.

The previous prime is 12231259. The next prime is 12231283. The reversal of 12231278 is 87213221.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 3057818 + ... + 3057821.

It is an arithmetic number, because the mean of its divisors is an integer number (4586730).

Almost surely, 2^12231278 is an apocalyptic number.

12231278 is a deficient number, since it is larger than the sum of its proper divisors (6115642).

12231278 is an equidigital number, since it uses as much as digits as its factorization.

12231278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115641.

The product of its digits is 1344, while the sum is 26.

The square root of 12231278 is about 3497.3244058852. The cubic root of 12231278 is about 230.4043171894.

Adding to 12231278 its reverse (87213221), we get a palindrome (99444499).

The spelling of 12231278 in words is "twelve million, two hundred thirty-one thousand, two hundred seventy-eight".