404087 has 4 divisors (see below), whose sum is σ = 421680. Its totient is φ = 386496.

The previous prime is 404081. The next prime is 404099. The reversal of 404087 is 780404.

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 404087 - 2⁸ = 403831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 17569 = 404087 / (4 + 0 + 4 + 0 + 8 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404081) 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, 8762 + ... + 8807.

It is an arithmetic number, because the mean of its divisors is an integer number (105420).

2⁴⁰⁴⁰⁸⁷ is an apocalyptic number.

404087 is a deficient number, since it is larger than the sum of its proper divisors (17593).

404087 is a wasteful number, since it uses less digits than its factorization.

404087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17592.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 404087 is about 635.6783777981. The cubic root of 404087 is about 73.9307240638.

The spelling of 404087 in words is "four hundred four thousand, eighty-seven".