404939 has 4 divisors (see below), whose sum is σ = 406224. Its totient is φ = 403656.

The previous prime is 404851. The next prime is 404941. The reversal of 404939 is 939404.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404959) 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, 194 + ... + 920.

It is an arithmetic number, because the mean of its divisors is an integer number (101556).

2⁴⁰⁴⁹³⁹ is an apocalyptic number.

404939 is a deficient number, since it is larger than the sum of its proper divisors (1285).

404939 is an equidigital number, since it uses as much as digits as its factorization.

404939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 404939 is about 636.3481751369. The cubic root of 404939 is about 73.9826475018.

The spelling of 404939 in words is "four hundred four thousand, nine hundred thirty-nine".