404839 has 4 divisors (see below), whose sum is σ = 406120. Its totient is φ = 403560.

The previous prime is 404837. The next prime is 404843. The reversal of 404839 is 938404.

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 not a de Polignac number, because 404839 - 2¹ = 404837 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404837) 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, 217 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (101530).

2⁴⁰⁴⁸³⁹ is an apocalyptic number.

404839 is a deficient number, since it is larger than the sum of its proper divisors (1281).

404839 is an equidigital number, since it uses as much as digits as its factorization.

404839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 404839 is about 636.2695969477. The cubic root of 404839 is about 73.9765569763.

The spelling of 404839 in words is "four hundred four thousand, eight hundred thirty-nine".