404544681 has 6 divisors (see below), whose sum is σ = 584342330. Its totient is φ = 269696448.

The previous prime is 404544667. The next prime is 404544683. The reversal of 404544681 is 186445404.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 374074281 + 30470400 = 19341^2 + 5520^2 .

It is not a de Polignac number, because 404544681 - 2⁶ = 404544617 is a prime.

It is a super-2 number, since 2×404544681² = 327312797850783522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404544683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22474696 + ... + 22474713.

Almost surely, 2^404544681 is an apocalyptic number.

It is an amenable number.

404544681 is a deficient number, since it is larger than the sum of its proper divisors (179797649).

404544681 is a wasteful number, since it uses less digits than its factorization.

404544681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44949415 (or 44949412 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 36.

The square root of 404544681 is about 20113.2961247032. The cubic root of 404544681 is about 739.5862558082.

The spelling of 404544681 in words is "four hundred four million, five hundred forty-four thousand, six hundred eighty-one".