13699391 has 4 divisors (see below), whose sum is σ = 13727784. Its totient is φ = 13671000.

The previous prime is 13699381. The next prime is 13699393. The reversal of 13699391 is 19399631.

13699391 is digitally balanced in base 2, 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: 19399631 = 127 ⋅152753.

It is a cyclic number.

It is not a de Polignac number, because 13699391 - 2²² = 9505087 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 (13699393) 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, 13460 + ... + 14441.

It is an arithmetic number, because the mean of its divisors is an integer number (3431946).

Almost surely, 2^13699391 is an apocalyptic number.

13699391 is a deficient number, since it is larger than the sum of its proper divisors (28393).

13699391 is an equidigital number, since it uses as much as digits as its factorization.

13699391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28392.

The product of its digits is 39366, while the sum is 41.

The square root of 13699391 is about 3701.2688364938. The cubic root of 13699391 is about 239.2767054793.

The spelling of 13699391 in words is "thirteen million, six hundred ninety-nine thousand, three hundred ninety-one".