423822 has 16 divisors (see below), whose sum is σ = 968832. Its totient is φ = 121080.

The previous prime is 423803. The next prime is 423823. The reversal of 423822 is 228324.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423823) by changing a digit.

423822 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 7 ways as a sum of consecutive naturals, for example, 5004 + ... + 5087.

It is an arithmetic number, because the mean of its divisors is an integer number (60552).

2⁴²³⁸²² is an apocalyptic number.

423822 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

423822 is an abundant number, since it is smaller than the sum of its proper divisors (545010).

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

423822 is a wasteful number, since it uses less digits than its factorization.

423822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10103.

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

The square root of 423822 is about 651.0161288325. The cubic root of 423822 is about 75.1152007377.

Subtracting from 423822 its sum of digits (21), we obtain a square (423801 = 651²).

The spelling of 423822 in words is "four hundred twenty-three thousand, eight hundred twenty-two".