404660 has 12 divisors (see below), whose sum is σ = 849828. Its totient is φ = 161856.

The previous prime is 404597. The next prime is 404671. The reversal of 404660 is 66404.

It can be written as a sum of positive squares in 2 ways, for example, as 178084 + 226576 = 422^2 + 476^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 20233 = 404660 / (4 + 0 + 4 + 6 + 6 + 0).

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

404660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10097 + ... + 10136.

It is an arithmetic number, because the mean of its divisors is an integer number (70819).

2⁴⁰⁴⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

404660 is an abundant number, since it is smaller than the sum of its proper divisors (445168).

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

404660 is a wasteful number, since it uses less digits than its factorization.

404660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20242 (or 20240 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 404660 is about 636.1289177517. The cubic root of 404660 is about 73.9656524309.

The spelling of 404660 in words is "four hundred four thousand, six hundred sixty".