404681 has 8 divisors (see below), whose sum is σ = 434400. Its totient is φ = 376884.

The previous prime is 404671. The next prime is 404693. The reversal of 404681 is 186404.

It is a happy number.

It is not a de Polignac number, because 404681 - 2¹⁸ = 142537 is a prime.

It is a super-2 number, since 2×404681² = 327533423522, which contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 6830 + ... + 6888.

It is an arithmetic number, because the mean of its divisors is an integer number (54300).

2⁴⁰⁴⁶⁸¹ is an apocalyptic number.

It is an amenable number.

404681 is a deficient number, since it is larger than the sum of its proper divisors (29719).

404681 is an frugal number, since it uses more digits than its factorization.

404681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 404681 is about 636.1454236258. The cubic root of 404681 is about 73.9669319016.

The spelling of 404681 in words is "four hundred four thousand, six hundred eighty-one".