420843 has 4 divisors (see below), whose sum is σ = 561128. Its totient is φ = 280560.

The previous prime is 420811. The next prime is 420851. The reversal of 420843 is 348024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 420843 - 2⁵ = 420811 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420803) 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, 70138 + ... + 70143.

It is an arithmetic number, because the mean of its divisors is an integer number (140282).

2⁴²⁰⁸⁴³ is an apocalyptic number.

420843 is a deficient number, since it is larger than the sum of its proper divisors (140285).

420843 is a wasteful number, since it uses less digits than its factorization.

420843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140284.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 420843 is about 648.7241324323. The cubic root of 420843 is about 74.9387945099.

Adding to 420843 its reverse (348024), we get a palindrome (768867).

The spelling of 420843 in words is "four hundred twenty thousand, eight hundred forty-three".