420415243 has 2 divisors, whose sum is σ = 420415244. Its totient is φ = 420415242.

The previous prime is 420415241. The next prime is 420415267. The reversal of 420415243 is 342514024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420415243 - 2¹ = 420415241 is a prime.

Together with 420415241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420415241) 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 as a sum of consecutive naturals, namely, 210207621 + 210207622.

It is an arithmetic number, because the mean of its divisors is an integer number (210207622).

Almost surely, 2^420415243 is an apocalyptic number.

420415243 is a deficient number, since it is larger than the sum of its proper divisors (1).

420415243 is an equidigital number, since it uses as much as digits as its factorization.

420415243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 420415243 is about 20504.0299209692. The cubic root of 420415243 is about 749.1339591641.

Adding to 420415243 its reverse (342514024), we get a palindrome (762929267).

The spelling of 420415243 in words is "four hundred twenty million, four hundred fifteen thousand, two hundred forty-three".