13891279 has 4 divisors (see below), whose sum is σ = 14214376. Its totient is φ = 13568184.

The previous prime is 13891271. The next prime is 13891289. The reversal of 13891279 is 97219831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97219831 = 37 ⋅2627563.

It is a cyclic number.

It is not a de Polignac number, because 13891279 - 2³ = 13891271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891271) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161484 + ... + 161569.

It is an arithmetic number, because the mean of its divisors is an integer number (3553594).

Almost surely, 2^13891279 is an apocalyptic number.

13891279 is a deficient number, since it is larger than the sum of its proper divisors (323097).

13891279 is an equidigital number, since it uses as much as digits as its factorization.

13891279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323096.

The product of its digits is 27216, while the sum is 40.

The square root of 13891279 is about 3727.1006157602. The cubic root of 13891279 is about 240.3887161406.

The spelling of 13891279 in words is "thirteen million, eight hundred ninety-one thousand, two hundred seventy-nine".