422406 has 24 divisors (see below), whose sum is σ = 945984. Its totient is φ = 136080.

The previous prime is 422393. The next prime is 422407. The reversal of 422406 is 604224.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422407) by changing a digit.

422406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180 + ... + 936.

It is an arithmetic number, because the mean of its divisors is an integer number (39416).

2⁴²²⁴⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 422406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472992).

422406 is an abundant number, since it is smaller than the sum of its proper divisors (523578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

422406 is a wasteful number, since it uses less digits than its factorization.

422406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 422406 is about 649.9276882854. The cubic root of 422406 is about 75.0314534739.

It can be divided in two parts, 422 and 406, that added together give a palindrome (828).

The spelling of 422406 in words is "four hundred twenty-two thousand, four hundred six".