420430243 has 4 divisors (see below), whose sum is σ = 420523488. Its totient is φ = 420337000.

The previous prime is 420430211. The next prime is 420430249. The reversal of 420430243 is 342034024.

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 420430243 - 2⁵ = 420430211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420430249) 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 3 ways as a sum of consecutive naturals, for example, 39496 + ... + 48997.

It is an arithmetic number, because the mean of its divisors is an integer number (105130872).

Almost surely, 2^420430243 is an apocalyptic number.

420430243 is a deficient number, since it is larger than the sum of its proper divisors (93245).

420430243 is an equidigital number, since it uses as much as digits as its factorization.

420430243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93244.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 420430243 is about 20504.3956994592. The cubic root of 420430243 is about 749.1428685110.

Adding to 420430243 its reverse (342034024), we get a palindrome (762464267).

The spelling of 420430243 in words is "four hundred twenty million, four hundred thirty thousand, two hundred forty-three".