13187399 has 4 divisors (see below), whose sum is σ = 13315536. Its totient is φ = 13059264.

The previous prime is 13187381. The next prime is 13187413. The reversal of 13187399 is 99378131.

13187399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13187399 - 2⁸ = 13187143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13187309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63914 + ... + 64119.

It is an arithmetic number, because the mean of its divisors is an integer number (3328884).

Almost surely, 2^13187399 is an apocalyptic number.

13187399 is a deficient number, since it is larger than the sum of its proper divisors (128137).

13187399 is a wasteful number, since it uses less digits than its factorization.

13187399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128136.

The product of its digits is 40824, while the sum is 41.

The square root of 13187399 is about 3631.4458553034. The cubic root of 13187399 is about 236.2579232713.

The spelling of 13187399 in words is "thirteen million, one hundred eighty-seven thousand, three hundred ninety-nine".