420323243 has 4 divisors (see below), whose sum is σ = 421959000. Its totient is φ = 418687488.

The previous prime is 420323221. The next prime is 420323251. The reversal of 420323243 is 342323024.

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 420323243 - 2²² = 416128939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420323143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817493 + ... + 818006.

It is an arithmetic number, because the mean of its divisors is an integer number (105489750).

Almost surely, 2^420323243 is an apocalyptic number.

420323243 is a deficient number, since it is larger than the sum of its proper divisors (1635757).

420323243 is a wasteful number, since it uses less digits than its factorization.

420323243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635756.

The product of its (nonzero) digits is 3456, while the sum is 23.

The square root of 420323243 is about 20501.7863368049. The cubic root of 420323243 is about 749.0793105333.

Adding to 420323243 its reverse (342323024), we get a palindrome (762646267).

The spelling of 420323243 in words is "four hundred twenty million, three hundred twenty-three thousand, two hundred forty-three".