404144581 has 4 divisors (see below), whose sum is σ = 410769964. Its totient is φ = 397519200.

The previous prime is 404144549. The next prime is 404144593. The reversal of 404144581 is 185441404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49575681 + 354568900 = 7041^2 + 18830^2 .

It is a cyclic number.

It is not a de Polignac number, because 404144581 - 2⁵ = 404144549 is a prime.

It is a super-2 number, since 2×404144581² = 326665684703331122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404144501) 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, 3312600 + ... + 3312721.

It is an arithmetic number, because the mean of its divisors is an integer number (102692491).

Almost surely, 2^404144581 is an apocalyptic number.

It is an amenable number.

404144581 is a deficient number, since it is larger than the sum of its proper divisors (6625383).

404144581 is an equidigital number, since it uses as much as digits as its factorization.

404144581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625382.

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 404144581 is about 20103.3475073183. The cubic root of 404144581 is about 739.3423552117.

Adding to 404144581 its reverse (185441404), we get a palindrome (589585985).

The spelling of 404144581 in words is "four hundred four million, one hundred forty-four thousand, five hundred eighty-one".