421844 has 12 divisors (see below), whose sum is σ = 743904. Its totient is φ = 209304.

The previous prime is 421831. The next prime is 421847. The reversal of 421844 is 448124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329 + ... + 975.

It is an arithmetic number, because the mean of its divisors is an integer number (61992).

2⁴²¹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

421844 is a deficient number, since it is larger than the sum of its proper divisors (322060).

421844 is a wasteful number, since it uses less digits than its factorization.

421844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 812 counting only the distinct ones).

The product of its digits is 1024, while the sum is 23.

The square root of 421844 is about 649.4951885888. The cubic root of 421844 is about 74.9981629180.

Subtracting from 421844 its sum of digits (23), we obtain a triangular number (421821 = T₉₁₈).

Adding to 421844 its reverse (448124), we get a palindrome (869968).

The spelling of 421844 in words is "four hundred twenty-one thousand, eight hundred forty-four".