13938521 has 4 divisors (see below), whose sum is σ = 14758452. Its totient is φ = 13118592.

The previous prime is 13938511. The next prime is 13938527. The reversal of 13938521 is 12583931.

13938521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12583931 = 2741 ⋅4591.

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 8202496 = 2395^2 + 2864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13938521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13938527) 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, 409940 + ... + 409973.

It is an arithmetic number, because the mean of its divisors is an integer number (3689613).

Almost surely, 2^13938521 is an apocalyptic number.

It is an amenable number.

13938521 is a deficient number, since it is larger than the sum of its proper divisors (819931).

13938521 is an equidigital number, since it uses as much as digits as its factorization.

13938521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819930.

The product of its digits is 6480, while the sum is 32.

The square root of 13938521 is about 3733.4328706969. The cubic root of 13938521 is about 240.6609155588.

The spelling of 13938521 in words is "thirteen million, nine hundred thirty-eight thousand, five hundred twenty-one".