404891 has 8 divisors (see below), whose sum is σ = 430464. Its totient is φ = 380160.

The previous prime is 404851. The next prime is 404941. The reversal of 404891 is 198404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404891 - 2⁶ = 404827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404891.

It is not an unprimeable number, because it can be changed into a prime (404851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (53808).

2⁴⁰⁴⁸⁹¹ is an apocalyptic number.

404891 is a deficient number, since it is larger than the sum of its proper divisors (25573).

404891 is a wasteful number, since it uses less digits than its factorization.

404891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 404891 is about 636.3104588171. The cubic root of 404891 is about 73.9797241747.

Multiplying 404891 by its sum of digits (26), we get a triangular number (10527166 = T₄₅₈₈).

The spelling of 404891 in words is "four hundred four thousand, eight hundred ninety-one".