13645399 has 4 divisors (see below), whose sum is σ = 14115960. Its totient is φ = 13174840.

The previous prime is 13645393. The next prime is 13645447. The reversal of 13645399 is 99354631.

13645399 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: 99354631 = 71 ⋅1399361.

It is a cyclic number.

It is not a de Polignac number, because 13645399 - 2⁵ = 13645367 is a prime.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13645393) 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, 235237 + ... + 235294.

It is an arithmetic number, because the mean of its divisors is an integer number (3528990).

Almost surely, 2^13645399 is an apocalyptic number.

13645399 is a deficient number, since it is larger than the sum of its proper divisors (470561).

13645399 is an equidigital number, since it uses as much as digits as its factorization.

13645399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470560.

The product of its digits is 87480, while the sum is 40.

The square root of 13645399 is about 3693.9679208136. The cubic root of 13645399 is about 238.9619460547.

The spelling of 13645399 in words is "thirteen million, six hundred forty-five thousand, three hundred ninety-nine".