13889639 has 4 divisors (see below), whose sum is σ = 14117400. Its totient is φ = 13661880.

The previous prime is 13889599. The next prime is 13889641. The reversal of 13889639 is 93698831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93698831 = 677 ⋅138403.

It is a cyclic number.

It is not a de Polignac number, because 13889639 - 2⁸ = 13889383 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 13889593 and 13889602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13889669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113789 + ... + 113910.

It is an arithmetic number, because the mean of its divisors is an integer number (3529350).

Almost surely, 2^13889639 is an apocalyptic number.

13889639 is a deficient number, since it is larger than the sum of its proper divisors (227761).

13889639 is an equidigital number, since it uses as much as digits as its factorization.

13889639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227760.

The product of its digits is 279936, while the sum is 47.

The square root of 13889639 is about 3726.8805991070. The cubic root of 13889639 is about 240.3792556964.

The spelling of 13889639 in words is "thirteen million, eight hundred eighty-nine thousand, six hundred thirty-nine".