13538739 has 8 divisors (see below), whose sum is σ = 18182080. Its totient is φ = 8960616.

The previous prime is 13538731. The next prime is 13538779. The reversal of 13538739 is 93783531.

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

It is not a de Polignac number, because 13538739 - 2³ = 13538731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13538697 and 13538706.

It is not an unprimeable number, because it can be changed into a prime (13538731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15817 + ... + 16650.

It is an arithmetic number, because the mean of its divisors is an integer number (2272760).

Almost surely, 2^13538739 is an apocalyptic number.

13538739 is a deficient number, since it is larger than the sum of its proper divisors (4643341).

13538739 is a wasteful number, since it uses less digits than its factorization.

13538739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32609.

The product of its digits is 68040, while the sum is 39.

The square root of 13538739 is about 3679.5025478996. The cubic root of 13538739 is about 238.3376970637.

The spelling of 13538739 in words is "thirteen million, five hundred thirty-eight thousand, seven hundred thirty-nine".