404564 has 6 divisors (see below), whose sum is σ = 707994. Its totient is φ = 202280.

The previous prime is 404557. The next prime is 404597. The reversal of 404564 is 465404.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 20164 = 620^2 + 142^2 .

It is a congruent number.

It is an unprimeable number.

404564 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50567 + ... + 50574.

It is an arithmetic number, because the mean of its divisors is an integer number (117999).

2⁴⁰⁴⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

404564 is a deficient number, since it is larger than the sum of its proper divisors (303430).

404564 is a wasteful number, since it uses less digits than its factorization.

404564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101145 (or 101143 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 404564 is about 636.0534568729. The cubic root of 404564 is about 73.9598028582.

Adding to 404564 its reverse (465404), we get a palindrome (869968).

The spelling of 404564 in words is "four hundred four thousand, five hundred sixty-four".