13938643 has 4 divisors (see below), whose sum is σ = 13979160. Its totient is φ = 13898128.

The previous prime is 13938581. The next prime is 13938671. The reversal of 13938643 is 34683931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34683931 = 23 ⋅1507997.

It is a cyclic number.

It is not a de Polignac number, because 13938643 - 2¹³ = 13930451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13938143) 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, 19738 + ... + 20431.

It is an arithmetic number, because the mean of its divisors is an integer number (3494790).

Almost surely, 2^13938643 is an apocalyptic number.

13938643 is a deficient number, since it is larger than the sum of its proper divisors (40517).

13938643 is an equidigital number, since it uses as much as digits as its factorization.

13938643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40516.

The product of its digits is 46656, while the sum is 37.

The square root of 13938643 is about 3733.4492095112. The cubic root of 13938643 is about 240.6616177028.

The spelling of 13938643 in words is "thirteen million, nine hundred thirty-eight thousand, six hundred forty-three".