13581394 has 4 divisors (see below), whose sum is σ = 20372094. Its totient is φ = 6790696.

The previous prime is 13581389. The next prime is 13581397. The reversal of 13581394 is 49318531.

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

It can be written as a sum of positive squares in only one way, i.e., 10323369 + 3258025 = 3213^2 + 1805^2 .

It is not an unprimeable number, because it can be changed into a prime (13581397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3395347 + ... + 3395350.

Almost surely, 2^13581394 is an apocalyptic number.

13581394 is a deficient number, since it is larger than the sum of its proper divisors (6790700).

13581394 is an equidigital number, since it uses as much as digits as its factorization.

13581394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790699.

The product of its digits is 12960, while the sum is 34.

The square root of 13581394 is about 3685.2942894700. The cubic root of 13581394 is about 238.5877360201.

The spelling of 13581394 in words is "thirteen million, five hundred eighty-one thousand, three hundred ninety-four".