12420406 has 4 divisors (see below), whose sum is σ = 18630612. Its totient is φ = 6210202.

The previous prime is 12420389. The next prime is 12420413. The reversal of 12420406 is 60402421.

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

It is a congruent number.

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, 3105100 + ... + 3105103.

It is an arithmetic number, because the mean of its divisors is an integer number (4657653).

Almost surely, 2^12420406 is an apocalyptic number.

12420406 is a deficient number, since it is larger than the sum of its proper divisors (6210206).

12420406 is an equidigital number, since it uses as much as digits as its factorization.

12420406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210205.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 12420406 is about 3524.2596385624. The cubic root of 12420406 is about 231.5858022782.

Adding to 12420406 its reverse (60402421), we get a palindrome (72822827).

The spelling of 12420406 in words is "twelve million, four hundred twenty thousand, four hundred six".