404781 has 16 divisors (see below), whose sum is σ = 592704. Its totient is φ = 244224.

The previous prime is 404779. The next prime is 404783. The reversal of 404781 is 187404.

It is an interprime number because it is at equal distance from previous prime (404779) and next prime (404783).

It is not a de Polignac number, because 404781 - 2¹ = 404779 is a prime.

It is a super-2 number, since 2×404781² = 327695315922, which contains 22 as substring.

It is a Curzon number.

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 404781.

It is not an unprimeable number, because it can be changed into a prime (404783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3730 + ... + 3836.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁴⁰⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

404781 is a deficient number, since it is larger than the sum of its proper divisors (187923).

404781 is a wasteful number, since it uses less digits than its factorization.

404781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 404781 is about 636.2240171512. The cubic root of 404781 is about 73.9730240120.

The spelling of 404781 in words is "four hundred four thousand, seven hundred eighty-one".