13938391 has 4 divisors (see below), whose sum is σ = 14544432. Its totient is φ = 13332352.

The previous prime is 13938383. The next prime is 13938403. The reversal of 13938391 is 19383931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19383931 = 7 ⋅2769133.

It is a cyclic number.

It is not a de Polignac number, because 13938391 - 2³ = 13938383 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 13938391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13938361) 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, 302986 + ... + 303031.

It is an arithmetic number, because the mean of its divisors is an integer number (3636108).

Almost surely, 2^13938391 is an apocalyptic number.

13938391 is a deficient number, since it is larger than the sum of its proper divisors (606041).

13938391 is an equidigital number, since it uses as much as digits as its factorization.

13938391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606040.

The product of its digits is 17496, while the sum is 37.

The square root of 13938391 is about 3733.4154604062. The cubic root of 13938391 is about 240.6601673680.

The spelling of 13938391 in words is "thirteen million, nine hundred thirty-eight thousand, three hundred ninety-one".