424404 has 18 divisors (see below), whose sum is σ = 1072890. Its totient is φ = 141456.

The previous prime is 424397. The next prime is 424423. The reversal of 424404 is 404424.

Added to its reverse (404424) it gives a triangular number (828828 = T₁₂₈₇).

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 248004 + 176400 = 498^2 + 420^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is an unprimeable number.

424404 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5859 + ... + 5930.

It is an arithmetic number, because the mean of its divisors is an integer number (59605).

2⁴²⁴⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

424404 is an abundant number, since it is smaller than the sum of its proper divisors (648486).

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

424404 is a wasteful number, since it uses less digits than its factorization.

424404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11799 (or 11794 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 424404 is about 651.4629690167. The cubic root of 424404 is about 75.1495681931.

Adding to 424404 its reverse (404424), we get a palindrome (828828).

It can be divided in two parts, 424 and 404, that added together give a palindrome (828).

The spelling of 424404 in words is "four hundred twenty-four thousand, four hundred four", and thus it is an iban number.