12420403 has 4 divisors (see below), whose sum is σ = 12465520. Its totient is φ = 12375288.

The previous prime is 12420389. The next prime is 12420413. The reversal of 12420403 is 30402421.

12420403 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30402421 = 7 ⋅4343203.

It is a cyclic number.

It is not a de Polignac number, because 12420403 - 2⁵ = 12420371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420413) 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 in 3 ways as a sum of consecutive naturals, for example, 22143 + ... + 22696.

It is an arithmetic number, because the mean of its divisors is an integer number (3116380).

Almost surely, 2^12420403 is an apocalyptic number.

12420403 is a deficient number, since it is larger than the sum of its proper divisors (45117).

12420403 is an equidigital number, since it uses as much as digits as its factorization.

12420403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45116.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12420403 is about 3524.2592129411. The cubic root of 12420403 is about 231.5857836326.

Adding to 12420403 its reverse (30402421), we get a palindrome (42822824).

The spelling of 12420403 in words is "twelve million, four hundred twenty thousand, four hundred three".