13404581 has 4 divisors (see below), whose sum is σ = 13731564. Its totient is φ = 13077600.

The previous prime is 13404569. The next prime is 13404613. The reversal of 13404581 is 18540431.

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 7480225 + 5924356 = 2735^2 + 2434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13404581 is a prime.

It is a super-2 number, since 2×13404581² = 359365583571122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13404581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13404511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163430 + ... + 163511.

It is an arithmetic number, because the mean of its divisors is an integer number (3432891).

Almost surely, 2^13404581 is an apocalyptic number.

It is an amenable number.

13404581 is a deficient number, since it is larger than the sum of its proper divisors (326983).

13404581 is an equidigital number, since it uses as much as digits as its factorization.

13404581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326982.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 13404581 is about 3661.2267069932. The cubic root of 13404581 is about 237.5478374553.

The spelling of 13404581 in words is "thirteen million, four hundred four thousand, five hundred eighty-one".