404815 has 4 divisors (see below), whose sum is σ = 485784. Its totient is φ = 323848.

The previous prime is 404783. The next prime is 404819. The reversal of 404815 is 518404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404815 - 2⁵ = 404783 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

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 (404819) 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 3 ways as a sum of consecutive naturals, for example, 40477 + ... + 40486.

It is an arithmetic number, because the mean of its divisors is an integer number (121446).

2⁴⁰⁴⁸¹⁵ is an apocalyptic number.

404815 is a deficient number, since it is larger than the sum of its proper divisors (80969).

404815 is an equidigital number, since it uses as much as digits as its factorization.

404815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80968.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 404815 is about 636.2507367383. The cubic root of 404815 is about 73.9750951010.

The spelling of 404815 in words is "four hundred four thousand, eight hundred fifteen".