404039 has 4 divisors (see below), whose sum is σ = 427824. Its totient is φ = 380256.

The previous prime is 404029. The next prime is 404051. The reversal of 404039 is 930404.

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

It is not a de Polignac number, because 404039 - 2⁸ = 403783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11867 + ... + 11900.

It is an arithmetic number, because the mean of its divisors is an integer number (106956).

2⁴⁰⁴⁰³⁹ is an apocalyptic number.

404039 is a deficient number, since it is larger than the sum of its proper divisors (23785).

404039 is a wasteful number, since it uses less digits than its factorization.

404039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23784.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 404039 is about 635.6406217353. The cubic root of 404039 is about 73.9277966288.

The spelling of 404039 in words is "four hundred four thousand, thirty-nine".