13809391 has 4 divisors (see below), whose sum is σ = 13931712. Its totient is φ = 13687072.

The previous prime is 13809377. The next prime is 13809413. The reversal of 13809391 is 19390831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19390831 = 277 ⋅70003.

It is a cyclic number.

It is not a de Polignac number, because 13809391 - 2⁵ = 13809359 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 (13809311) 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, 60991 + ... + 61216.

It is an arithmetic number, because the mean of its divisors is an integer number (3482928).

Almost surely, 2^13809391 is an apocalyptic number.

13809391 is a deficient number, since it is larger than the sum of its proper divisors (122321).

13809391 is a wasteful number, since it uses less digits than its factorization.

13809391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122320.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 13809391 is about 3716.0988953471. The cubic root of 13809391 is about 239.9154273772.

The spelling of 13809391 in words is "thirteen million, eight hundred nine thousand, three hundred ninety-one".