404388871 has 4 divisors (see below), whose sum is σ = 404470512. Its totient is φ = 404307232.

The previous prime is 404388857. The next prime is 404388883. The reversal of 404388871 is 178883404.

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 404388871 - 2⁵ = 404388839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404388811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32875 + ... + 43468.

It is an arithmetic number, because the mean of its divisors is an integer number (101117628).

Almost surely, 2^404388871 is an apocalyptic number.

404388871 is a deficient number, since it is larger than the sum of its proper divisors (81641).

404388871 is an equidigital number, since it uses as much as digits as its factorization.

404388871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81640.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 404388871 is about 20109.4224432230. The cubic root of 404388871 is about 739.4912933008.

The spelling of 404388871 in words is "four hundred four million, three hundred eighty-eight thousand, eight hundred seventy-one".