420403123 has 4 divisors (see below), whose sum is σ = 480460720. Its totient is φ = 360345528.

The previous prime is 420403103. The next prime is 420403127. The reversal of 420403123 is 321304024.

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

It is a cyclic number.

It is not a de Polignac number, because 420403123 - 2²⁵ = 386848691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420403123.

It is not an unprimeable number, because it can be changed into a prime (420403127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30028788 + ... + 30028801.

It is an arithmetic number, because the mean of its divisors is an integer number (120115180).

Almost surely, 2^420403123 is an apocalyptic number.

420403123 is a deficient number, since it is larger than the sum of its proper divisors (60057597).

420403123 is an equidigital number, since it uses as much as digits as its factorization.

420403123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60057596.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 420403123 is about 20503.7343671830. The cubic root of 420403123 is about 749.1267602570.

Adding to 420403123 its reverse (321304024), we get a palindrome (741707147).

Subtracting from 420403123 its reverse (321304024), we obtain a palindrome (99099099).

The spelling of 420403123 in words is "four hundred twenty million, four hundred three thousand, one hundred twenty-three".