404221424 has 20 divisors (see below), whose sum is σ = 783632136. Its totient is φ = 201993792.

The previous prime is 404221423. The next prime is 404221439. The reversal of 404221424 is 424122404.

It is a self number, because there is not a number n which added to its sum of digits gives 404221424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404221421) 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, 25742 + ... + 38354.

Almost surely, 2^404221424 is an apocalyptic number.

It is an amenable number.

404221424 is a deficient number, since it is larger than the sum of its proper divisors (379410712).

404221424 is a wasteful number, since it uses less digits than its factorization.

404221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14624 (or 14618 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 404221424 is about 20105.2586155961. The cubic root of 404221424 is about 739.3892111200.

Adding to 404221424 its reverse (424122404), we get a palindrome (828343828).

The spelling of 404221424 in words is "four hundred four million, two hundred twenty-one thousand, four hundred twenty-four".