404665 has 4 divisors (see below), whose sum is σ = 485604. Its totient is φ = 323728.

The previous prime is 404597. The next prime is 404671. The reversal of 404665 is 566404.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 251001 = 392^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 404665 - 2¹⁵ = 371897 is a prime.

It is a Duffinian number.

404665 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40462 + ... + 40471.

It is an arithmetic number, because the mean of its divisors is an integer number (121401).

2⁴⁰⁴⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

404665 is a deficient number, since it is larger than the sum of its proper divisors (80939).

404665 is an equidigital number, since it uses as much as digits as its factorization.

404665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80938.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 404665 is about 636.1328477606. The cubic root of 404665 is about 73.9659570708.

The spelling of 404665 in words is "four hundred four thousand, six hundred sixty-five".