404028 has 60 divisors (see below), whose sum is σ = 1118040. Its totient is φ = 127008.

The previous prime is 404021. The next prime is 404029. The reversal of 404028 is 820404.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 404028.

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 404028.

It is not an unprimeable number, because it can be changed into a prime (404021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9375 + ... + 9417.

It is an arithmetic number, because the mean of its divisors is an integer number (18634).

2⁴⁰⁴⁰²⁸ 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 404028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559020).

404028 is an abundant number, since it is smaller than the sum of its proper divisors (714012).

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

404028 is a wasteful number, since it uses less digits than its factorization.

404028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 404028 is about 635.6319689883. The cubic root of 404028 is about 73.9271257256.

The spelling of 404028 in words is "four hundred four thousand, twenty-eight".