404220 has 24 divisors (see below), whose sum is σ = 1131984. Its totient is φ = 107776.

The previous prime is 404213. The next prime is 404221. The reversal of 404220 is 22404.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 404196 and 404205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404221) by changing a digit.

404220 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 7 ways as a sum of consecutive naturals, for example, 3309 + ... + 3428.

It is an arithmetic number, because the mean of its divisors is an integer number (47166).

2⁴⁰⁴²²⁰ is an apocalyptic number.

It is an amenable number.

404220 is an abundant number, since it is smaller than the sum of its proper divisors (727764).

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

404220 is a wasteful number, since it uses less digits than its factorization.

404220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749 (or 6747 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 404220 is about 635.7829818421. The cubic root of 404220 is about 73.9388342873.

Adding to 404220 its reverse (22404), we get a palindrome (426624).

The spelling of 404220 in words is "four hundred four thousand, two hundred twenty", and thus it is an iban number.