13938686 has 4 divisors (see below), whose sum is σ = 20908032. Its totient is φ = 6969342.

The previous prime is 13938679. The next prime is 13938697. The reversal of 13938686 is 68683931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68683931 = 139 ⋅494129.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3484670 + ... + 3484673.

It is an arithmetic number, because the mean of its divisors is an integer number (5227008).

Almost surely, 2^13938686 is an apocalyptic number.

13938686 is a deficient number, since it is larger than the sum of its proper divisors (6969346).

13938686 is an equidigital number, since it uses as much as digits as its factorization.

13938686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6969345.

The product of its digits is 186624, while the sum is 44.

The square root of 13938686 is about 3733.4549682566. The cubic root of 13938686 is about 240.6618651788.

The spelling of 13938686 in words is "thirteen million, nine hundred thirty-eight thousand, six hundred eighty-six".