404190 has 40 divisors (see below), whose sum is σ = 1089000. Its totient is φ = 107568.

The previous prime is 404189. The next prime is 404191. The reversal of 404190 is 91404.

It is an interprime number because it is at equal distance from previous prime (404189) and next prime (404191).

It is a super-2 number, since 2×404190² = 326739112200, which contains 22 as substring.

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

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 404190.

It is not an unprimeable number, because it can be changed into a prime (404191) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 561 + ... + 1059.

It is an arithmetic number, because the mean of its divisors is an integer number (27225).

2⁴⁰⁴¹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (544500).

404190 is an abundant number, since it is smaller than the sum of its proper divisors (684810).

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

404190 is a wasteful number, since it uses less digits than its factorization.

404190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 404190 is about 635.7593884482. The cubic root of 404190 is about 73.9370050690.

Adding to 404190 its reverse (91404), we get a palindrome (495594).

The spelling of 404190 in words is "four hundred four thousand, one hundred ninety".