404385 has 8 divisors (see below), whose sum is σ = 647040. Its totient is φ = 215664.

The previous prime is 404381. The next prime is 404387. The reversal of 404385 is 583404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404385 - 2² = 404381 is a prime.

It is a Curzon number.

404385 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404381) 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, 13465 + ... + 13494.

It is an arithmetic number, because the mean of its divisors is an integer number (80880).

2⁴⁰⁴³⁸⁵ is an apocalyptic number.

It is an amenable number.

404385 is a deficient number, since it is larger than the sum of its proper divisors (242655).

404385 is a wasteful number, since it uses less digits than its factorization.

404385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26967.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 404385 is about 635.9127298616. The cubic root of 404385 is about 73.9488933707.

Adding to 404385 its reverse (583404), we get a palindrome (987789).

The spelling of 404385 in words is "four hundred four thousand, three hundred eighty-five".