420000443 has 2 divisors, whose sum is σ = 420000444. Its totient is φ = 420000442.

The previous prime is 420000439. The next prime is 420000457. The reversal of 420000443 is 344000024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420000443 - 2² = 420000439 is a prime.

It is not a weakly prime, because it can be changed into another prime (420000403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210000221 + 210000222.

It is an arithmetic number, because the mean of its divisors is an integer number (210000222).

Almost surely, 2^420000443 is an apocalyptic number.

420000443 is a deficient number, since it is larger than the sum of its proper divisors (1).

420000443 is an equidigital number, since it uses as much as digits as its factorization.

420000443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 420000443 is about 20493.9123400097. The cubic root of 420000443 is about 748.8875020210.

Adding to 420000443 its reverse (344000024), we get a palindrome (764000467).

The spelling of 420000443 in words is "four hundred twenty million, four hundred forty-three", and thus it is an aban number.