404544 has 84 divisors (see below), whose sum is σ = 1274064. Its totient is φ = 112896.

The previous prime is 404539. The next prime is 404557. The reversal of 404544 is 445404.

It is a tau number, because it is divible by the number of its divisors (84).

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

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 404544.

It is an unprimeable number.

404544 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, 9387 + ... + 9429.

2⁴⁰⁴⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637032).

404544 is an abundant number, since it is smaller than the sum of its proper divisors (869520).

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

404544 is a wasteful number, since it uses less digits than its factorization.

404544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 404544 is about 636.0377347296. The cubic root of 404544 is about 73.9585840808.

Adding to 404544 its reverse (445404), we get a palindrome (849948).

The spelling of 404544 in words is "four hundred four thousand, five hundred forty-four".