42404 has 6 divisors (see below), whose sum is σ = 74214. Its totient is φ = 21200.

The previous prime is 42403. The next prime is 42407. The reversal of 42404 is 40424.

It can be written as a sum of positive squares in only one way, i.e., 40804 + 1600 = 202^2 + 40^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5297 + ... + 5304.

It is an arithmetic number, because the mean of its divisors is an integer number (12369).

2⁴²⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

42404 is a deficient number, since it is larger than the sum of its proper divisors (31810).

42404 is a wasteful number, since it uses less digits than its factorization.

42404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605 (or 10603 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 42404 is about 205.9223154493. The cubic root of 42404 is about 34.8713645401.

Adding to 42404 its reverse (40424), we get a palindrome (82828).

The spelling of 42404 in words is "forty-two thousand, four hundred four", and thus it is an iban number.