12420424 has 8 divisors (see below), whose sum is σ = 23288310. Its totient is φ = 6210208.

The previous prime is 12420413. The next prime is 12420451. The reversal of 12420424 is 42402421.

It can be written as a sum of positive squares in only one way, i.e., 12376324 + 44100 = 3518^2 + 210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 776269 + ... + 776284.

Almost surely, 2^12420424 is an apocalyptic number.

It is an amenable number.

12420424 is a deficient number, since it is larger than the sum of its proper divisors (10867886).

12420424 is a wasteful number, since it uses less digits than its factorization.

12420424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552559 (or 1552555 counting only the distinct ones).

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

The square root of 12420424 is about 3524.2621922893. The cubic root of 12420424 is about 231.5859141517.

Adding to 12420424 its reverse (42402421), we get a palindrome (54822845).

The spelling of 12420424 in words is "twelve million, four hundred twenty thousand, four hundred twenty-four".