12145442 has 4 divisors (see below), whose sum is σ = 18218166. Its totient is φ = 6072720.

The previous prime is 12145439. The next prime is 12145447. The reversal of 12145442 is 24454121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24454121 = 19 ⋅1287059.

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 3031081 = 3019^2 + 1741^2 .

It is a super-2 number, since 2×12145442² = 295023522750728, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12145447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3036359 + ... + 3036362.

Almost surely, 2^12145442 is an apocalyptic number.

12145442 is a deficient number, since it is larger than the sum of its proper divisors (6072724).

12145442 is an equidigital number, since it uses as much as digits as its factorization.

12145442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6072723.

The product of its digits is 1280, while the sum is 23.

The square root of 12145442 is about 3485.0311332899. The cubic root of 12145442 is about 229.8640784814.

Adding to 12145442 its reverse (24454121), we get a palindrome (36599563).

The spelling of 12145442 in words is "twelve million, one hundred forty-five thousand, four hundred forty-two".