12243155 has 4 divisors (see below), whose sum is σ = 14691792. Its totient is φ = 9794520.

The previous prime is 12243151. The next prime is 12243157. The reversal of 12243155 is 55134221.

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

It is not a de Polignac number, because 12243155 - 2² = 12243151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12243155.

It is not an unprimeable number, because it can be changed into a prime (12243151) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1224311 + ... + 1224320.

It is an arithmetic number, because the mean of its divisors is an integer number (3672948).

Almost surely, 2^12243155 is an apocalyptic number.

12243155 is a deficient number, since it is larger than the sum of its proper divisors (2448637).

12243155 is an equidigital number, since it uses as much as digits as its factorization.

12243155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448636.

The product of its digits is 1200, while the sum is 23.

The square root of 12243155 is about 3499.0220062183. The cubic root of 12243155 is about 230.4788699549.

Adding to 12243155 its reverse (55134221), we get a palindrome (67377376).

The spelling of 12243155 in words is "twelve million, two hundred forty-three thousand, one hundred fifty-five".