13187994 has 16 divisors (see below), whose sum is σ = 26477280. Its totient is φ = 4379120.

The previous prime is 13187987. The next prime is 13188001. The reversal of 13187994 is 49978131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13187987) and next prime (13188001).

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 2472 + ... + 5699.

It is an arithmetic number, because the mean of its divisors is an integer number (1654830).

Almost surely, 2^13187994 is an apocalyptic number.

13187994 is an abundant number, since it is smaller than the sum of its proper divisors (13289286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13187994 is a wasteful number, since it uses less digits than its factorization.

13187994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8445.

The product of its digits is 54432, while the sum is 42.

The square root of 13187994 is about 3631.5277776715. The cubic root of 13187994 is about 236.2614764448.

The spelling of 13187994 in words is "thirteen million, one hundred eighty-seven thousand, nine hundred ninety-four".