404390 has 32 divisors (see below), whose sum is σ = 855360. Its totient is φ = 134784.

The previous prime is 404389. The next prime is 404399. The reversal of 404390 is 93404.

404390 = 60² + 61² + ... + 112².

It is a super-3 number, since 3×404390³ = 198391233373557000, which contains 333 as substring.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3656 + ... + 3764.

It is an arithmetic number, because the mean of its divisors is an integer number (26730).

2⁴⁰⁴³⁹⁰ is an apocalyptic number.

404390 is an abundant number, since it is smaller than the sum of its proper divisors (450970).

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

404390 is a wasteful number, since it uses less digits than its factorization.

404390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 404390 is about 635.9166612065. The cubic root of 404390 is about 73.9491981487.

Adding to 404390 its reverse (93404), we get a palindrome (497794).

The spelling of 404390 in words is "four hundred four thousand, three hundred ninety".