13994639 has 4 divisors (see below), whose sum is σ = 14019720. Its totient is φ = 13969560.

The previous prime is 13994593. The next prime is 13994641. The reversal of 13994639 is 93649931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93649931 = 107 ⋅875233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13994639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13994639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13994699) 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 3 ways as a sum of consecutive naturals, for example, 11684 + ... + 12825.

It is an arithmetic number, because the mean of its divisors is an integer number (3504930).

Almost surely, 2^13994639 is an apocalyptic number.

13994639 is a deficient number, since it is larger than the sum of its proper divisors (25081).

13994639 is an equidigital number, since it uses as much as digits as its factorization.

13994639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25080.

The product of its digits is 157464, while the sum is 44.

The square root of 13994639 is about 3740.9409244200. The cubic root of 13994639 is about 240.9834587454.

The spelling of 13994639 in words is "thirteen million, nine hundred ninety-four thousand, six hundred thirty-nine".