12420442 has 4 divisors (see below), whose sum is σ = 18630666. Its totient is φ = 6210220.

The previous prime is 12420413. The next prime is 12420451. The reversal of 12420442 is 24402421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24402421 = 41 ⋅595181.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 1929321 = 3239^2 + 1389^2 .

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, 3105109 + ... + 3105112.

Almost surely, 2^12420442 is an apocalyptic number.

12420442 is a deficient number, since it is larger than the sum of its proper divisors (6210224).

12420442 is an equidigital number, since it uses as much as digits as its factorization.

12420442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210223.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 12420442 is about 3524.2647460144. The cubic root of 12420442 is about 231.5860260251.

Adding to 12420442 its reverse (24402421), we get a palindrome (36822863).

The spelling of 12420442 in words is "twelve million, four hundred twenty thousand, four hundred forty-two".