404661 has 4 divisors (see below), whose sum is σ = 539552. Its totient is φ = 269772.

The previous prime is 404597. The next prime is 404671. The reversal of 404661 is 166404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 404661 - 2⁶ = 404597 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 404661.

It is not an unprimeable number, because it can be changed into a prime (404671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67441 + ... + 67446.

It is an arithmetic number, because the mean of its divisors is an integer number (134888).

2⁴⁰⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

404661 is a deficient number, since it is larger than the sum of its proper divisors (134891).

404661 is a wasteful number, since it uses less digits than its factorization.

404661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134890.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 404661 is about 636.1297037555. The cubic root of 404661 is about 73.9657133591.

The spelling of 404661 in words is "four hundred four thousand, six hundred sixty-one".