13791397 has 4 divisors (see below), whose sum is σ = 14517280. Its totient is φ = 13065516.

The previous prime is 13791389. The next prime is 13791409. The reversal of 13791397 is 79319731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79319731 = 31 ⋅2558701.

It is a cyclic number.

It is not a de Polignac number, because 13791397 - 2³ = 13791389 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 (13791317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362913 + ... + 362950.

It is an arithmetic number, because the mean of its divisors is an integer number (3629320).

Almost surely, 2^13791397 is an apocalyptic number.

It is an amenable number.

13791397 is a deficient number, since it is larger than the sum of its proper divisors (725883).

13791397 is an equidigital number, since it uses as much as digits as its factorization.

13791397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725882.

The product of its digits is 35721, while the sum is 40.

The square root of 13791397 is about 3713.6770188049. The cubic root of 13791397 is about 239.8111767111.

The spelling of 13791397 in words is "thirteen million, seven hundred ninety-one thousand, three hundred ninety-seven".