13739809 has 4 divisors (see below), whose sum is σ = 14337216. Its totient is φ = 13142404.

The previous prime is 13739801. The next prime is 13739821. The reversal of 13739809 is 90893731.

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: 90893731 = 821 ⋅110711.

It is a cyclic number.

It is not a de Polignac number, because 13739809 - 2³ = 13739801 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13739801) 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, 298669 + ... + 298714.

It is an arithmetic number, because the mean of its divisors is an integer number (3584304).

Almost surely, 2^13739809 is an apocalyptic number.

It is an amenable number.

13739809 is a deficient number, since it is larger than the sum of its proper divisors (597407).

13739809 is an equidigital number, since it uses as much as digits as its factorization.

13739809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597406.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 13739809 is about 3706.7248346755. The cubic root of 13739809 is about 239.5117911219.

The spelling of 13739809 in words is "thirteen million, seven hundred thirty-nine thousand, eight hundred nine".