13138749 has 12 divisors (see below), whose sum is σ = 20438236. Its totient is φ = 8085312.

The previous prime is 13138721. The next prime is 13138757. The reversal of 13138749 is 94783131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3572100 + 9566649 = 1890^2 + 3093^2 .

It is not a de Polignac number, because 13138749 - 2⁸ = 13138493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13138789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56032 + ... + 56265.

Almost surely, 2^13138749 is an apocalyptic number.

It is an amenable number.

13138749 is a deficient number, since it is larger than the sum of its proper divisors (7299487).

13138749 is a wasteful number, since it uses less digits than its factorization.

13138749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112316 (or 112313 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 13138749 is about 3624.7412321433. The cubic root of 13138749 is about 235.9670367156.

The spelling of 13138749 in words is "thirteen million, one hundred thirty-eight thousand, seven hundred forty-nine".