13138787 has 4 divisors (see below), whose sum is σ = 13268976. Its totient is φ = 13008600.

The previous prime is 13138781. The next prime is 13138789. The reversal of 13138787 is 78783131.

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 13138787 - 2⁴ = 13138771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13138787.

It is not an unprimeable number, because it can be changed into a prime (13138781) 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 in 3 ways as a sum of consecutive naturals, for example, 64943 + ... + 65144.

It is an arithmetic number, because the mean of its divisors is an integer number (3317244).

Almost surely, 2^13138787 is an apocalyptic number.

13138787 is a deficient number, since it is larger than the sum of its proper divisors (130189).

13138787 is a wasteful number, since it uses less digits than its factorization.

13138787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130188.

The product of its digits is 28224, while the sum is 38.

The square root of 13138787 is about 3624.7464738930. The cubic root of 13138787 is about 235.9672642040.

The spelling of 13138787 in words is "thirteen million, one hundred thirty-eight thousand, seven hundred eighty-seven".