404538 has 16 divisors (see below), whose sum is σ = 815616. Its totient is φ = 133760.

The previous prime is 404533. The next prime is 404539. The reversal of 404538 is 835404.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (404531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970 + ... + 1322.

It is an arithmetic number, because the mean of its divisors is an integer number (50976).

2⁴⁰⁴⁵³⁸ is an apocalyptic number.

404538 is an abundant number, since it is smaller than the sum of its proper divisors (411078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404538 is a wasteful number, since it uses less digits than its factorization.

404538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 404538 is about 636.0330180109. The cubic root of 404538 is about 73.9582184397.

The spelling of 404538 in words is "four hundred four thousand, five hundred thirty-eight".