404687 has 4 divisors (see below), whose sum is σ = 408720. Its totient is φ = 400656.

The previous prime is 404671. The next prime is 404693. The reversal of 404687 is 786404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404687 - 2⁴ = 404671 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404387) 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 3 ways as a sum of consecutive naturals, for example, 1862 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (102180).

2⁴⁰⁴⁶⁸⁷ is an apocalyptic number.

404687 is a deficient number, since it is larger than the sum of its proper divisors (4033).

404687 is a wasteful number, since it uses less digits than its factorization.

404687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 404687 is about 636.1501395111. The cubic root of 404687 is about 73.9672974565.

The spelling of 404687 in words is "four hundred four thousand, six hundred eighty-seven".