420313643 has 2 divisors, whose sum is σ = 420313644. Its totient is φ = 420313642.

The previous prime is 420313609. The next prime is 420313679. The reversal of 420313643 is 346313024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420313643 - 2¹⁶ = 420248107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (420313603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210156821 + 210156822.

It is an arithmetic number, because the mean of its divisors is an integer number (210156822).

Almost surely, 2^420313643 is an apocalyptic number.

420313643 is a deficient number, since it is larger than the sum of its proper divisors (1).

420313643 is an equidigital number, since it uses as much as digits as its factorization.

420313643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 420313643 is about 20501.5522095279. The cubic root of 420313643 is about 749.0736076081.

Adding to 420313643 its reverse (346313024), we get a palindrome (766626667).

The spelling of 420313643 in words is "four hundred twenty million, three hundred thirteen thousand, six hundred forty-three".