13727809 has 2 divisors, whose sum is σ = 13727810. Its totient is φ = 13727808.

The previous prime is 13727783. The next prime is 13727821. The reversal of 13727809 is 90872731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 784 = 3705^2 + 28^2 .

It is an emirp because it is prime and its reverse (90872731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13727809 is a prime.

It is not a weakly prime, because it can be changed into another prime (13727839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6863904 + 6863905.

It is an arithmetic number, because the mean of its divisors is an integer number (6863905).

Almost surely, 2^13727809 is an apocalyptic number.

It is an amenable number.

13727809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13727809 is an equidigital number, since it uses as much as digits as its factorization.

13727809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 13727809 is about 3705.1058014583. The cubic root of 13727809 is about 239.4420429754.

The spelling of 13727809 in words is "thirteen million, seven hundred twenty-seven thousand, eight hundred nine".