404490 has 32 divisors (see below), whose sum is σ = 987840. Its totient is φ = 105984.

The previous prime is 404489. The next prime is 404497. The reversal of 404490 is 94404.

It is a happy number.

It is a super-2 number, since 2×404490² = 327224320200, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404490.

It is not an unprimeable number, because it can be changed into a prime (404497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2841 + ... + 2979.

It is an arithmetic number, because the mean of its divisors is an integer number (30870).

2⁴⁰⁴⁴⁹⁰ is an apocalyptic number.

404490 is an abundant number, since it is smaller than the sum of its proper divisors (583350).

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

404490 is a wasteful number, since it uses less digits than its factorization.

404490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 404490 is about 635.9952830014. The cubic root of 404490 is about 73.9552931810.

Adding to 404490 its reverse (94404), we get a palindrome (498894).

The spelling of 404490 in words is "four hundred four thousand, four hundred ninety".