12243542 has 4 divisors (see below), whose sum is σ = 18365316. Its totient is φ = 6121770.

The previous prime is 12243541. The next prime is 12243551. The reversal of 12243542 is 24534221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24534221 = 113 ⋅217117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12243541) 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 as a sum of consecutive naturals, namely, 3060884 + ... + 3060887.

It is an arithmetic number, because the mean of its divisors is an integer number (4591329).

Almost surely, 2^12243542 is an apocalyptic number.

12243542 is a deficient number, since it is larger than the sum of its proper divisors (6121774).

12243542 is an equidigital number, since it uses as much as digits as its factorization.

12243542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6121773.

The product of its digits is 1920, while the sum is 23.

The square root of 12243542 is about 3499.0773069482. The cubic root of 12243542 is about 230.4812983699.

Adding to 12243542 its reverse (24534221), we get a palindrome (36777763).

The spelling of 12243542 in words is "twelve million, two hundred forty-three thousand, five hundred forty-two".