13791639 has 8 divisors (see below), whose sum is σ = 18886000. Its totient is φ = 8945856.

The previous prime is 13791637. The next prime is 13791643. The reversal of 13791639 is 93619731.

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

It is not a de Polignac number, because 13791639 - 2¹ = 13791637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13791597 and 13791606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13791637) 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 7 ways as a sum of consecutive naturals, for example, 62014 + ... + 62235.

It is an arithmetic number, because the mean of its divisors is an integer number (2360750).

Almost surely, 2^13791639 is an apocalyptic number.

13791639 is a deficient number, since it is larger than the sum of its proper divisors (5094361).

13791639 is a wasteful number, since it uses less digits than its factorization.

13791639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124289.

The product of its digits is 30618, while the sum is 39.

The square root of 13791639 is about 3713.7096009247. The cubic root of 13791639 is about 239.8125793722.

The spelling of 13791639 in words is "thirteen million, seven hundred ninety-one thousand, six hundred thirty-nine".