420305443 has 16 divisors (see below), whose sum is σ = 437746176. Its totient is φ = 403302240.

The previous prime is 420305429. The next prime is 420305447. The reversal of 420305443 is 344503024.

It is a cyclic number.

It is not a de Polignac number, because 420305443 - 2²¹ = 418208291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420305447) 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 15 ways as a sum of consecutive naturals, for example, 635533 + ... + 636193.

It is an arithmetic number, because the mean of its divisors is an integer number (27359136).

Almost surely, 2^420305443 is an apocalyptic number.

420305443 is a deficient number, since it is larger than the sum of its proper divisors (17440733).

420305443 is a wasteful number, since it uses less digits than its factorization.

420305443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 420305443 is about 20501.3522236949. The cubic root of 420305443 is about 749.0687362906.

Adding to 420305443 its reverse (344503024), we get a palindrome (764808467).

The spelling of 420305443 in words is "four hundred twenty million, three hundred five thousand, four hundred forty-three".