13563994 has 8 divisors (see below), whose sum is σ = 21542868. Its totient is φ = 6383040.

The previous prime is 13563973. The next prime is 13564007. The reversal of 13563994 is 49936531.

It can be written as a sum of positive squares in 2 ways, for example, as 13432225 + 131769 = 3665^2 + 363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199437 + ... + 199504.

Almost surely, 2^13563994 is an apocalyptic number.

13563994 is a deficient number, since it is larger than the sum of its proper divisors (7978874).

13563994 is a wasteful number, since it uses less digits than its factorization.

13563994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398960.

The product of its digits is 87480, while the sum is 40.

The square root of 13563994 is about 3682.9327987353. The cubic root of 13563994 is about 238.4858024297.

The spelling of 13563994 in words is "thirteen million, five hundred sixty-three thousand, nine hundred ninety-four".