404090 has 16 divisors (see below), whose sum is σ = 770472. Its totient is φ = 152064.

The previous prime is 404081. The next prime is 404099. The reversal of 404090 is 90404.

It is an interprime number because it is at equal distance from previous prime (404081) and next prime (404099).

It can be written as a sum of positive squares in 4 ways, for example, as 351649 + 52441 = 593^2 + 229^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404090.

It is not an unprimeable number, because it can be changed into a prime (404099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1019 + ... + 1358.

2⁴⁰⁴⁰⁹⁰ is an apocalyptic number.

404090 is a deficient number, since it is larger than the sum of its proper divisors (366382).

404090 is a wasteful number, since it uses less digits than its factorization.

404090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 404090 is about 635.6807374775. The cubic root of 404090 is about 73.9309070208.

Adding to 404090 its reverse (90404), we get a palindrome (494494).

The spelling of 404090 in words is "four hundred four thousand, ninety".