13639047 has 4 divisors (see below), whose sum is σ = 18185400. Its totient is φ = 9092696.

The previous prime is 13639037. The next prime is 13639063. The reversal of 13639047 is 74093631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74093631 = 3 ⋅24697877.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13639047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13638999 and 13639017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2273172 + ... + 2273177.

It is an arithmetic number, because the mean of its divisors is an integer number (4546350).

Almost surely, 2^13639047 is an apocalyptic number.

13639047 is a deficient number, since it is larger than the sum of its proper divisors (4546353).

13639047 is an equidigital number, since it uses as much as digits as its factorization.

13639047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546352.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 13639047 is about 3693.1080406617. The cubic root of 13639047 is about 238.9248609813.

The spelling of 13639047 in words is "thirteen million, six hundred thirty-nine thousand, forty-seven".