423644 has 12 divisors (see below), whose sum is σ = 798504. Its totient is φ = 195504.

The previous prime is 423617. The next prime is 423649. The reversal of 423644 is 446324.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 423644.

It is not an unprimeable number, because it can be changed into a prime (423649) 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, 4022 + ... + 4125.

It is an arithmetic number, because the mean of its divisors is an integer number (66542).

2⁴²³⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

423644 is a deficient number, since it is larger than the sum of its proper divisors (374860).

423644 is a wasteful number, since it uses less digits than its factorization.

423644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8164 (or 8162 counting only the distinct ones).

The product of its digits is 2304, while the sum is 23.

The square root of 423644 is about 650.8794051128. The cubic root of 423644 is about 75.1046834467.

Adding to 423644 its reverse (446324), we get a palindrome (869968).

The spelling of 423644 in words is "four hundred twenty-three thousand, six hundred forty-four".