16386809 has 4 divisors (see below), whose sum is σ = 16394916. Its totient is φ = 16378704.

The previous prime is 16386803. The next prime is 16386841. The reversal of 16386809 is 90868361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90868361 = 797 ⋅114013.

It can be written as a sum of positive squares in 2 ways, for example, as 10061584 + 6325225 = 3172^2 + 2515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16386809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16386803) 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, 1727 + ... + 5979.

It is an arithmetic number, because the mean of its divisors is an integer number (4098729).

Almost surely, 2^16386809 is an apocalyptic number.

It is an amenable number.

16386809 is a deficient number, since it is larger than the sum of its proper divisors (8107).

16386809 is an equidigital number, since it uses as much as digits as its factorization.

16386809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 16386809 is about 4048.0623760016. The cubic root of 16386809 is about 253.9986824905.

The spelling of 16386809 in words is "sixteen million, three hundred eighty-six thousand, eight hundred nine".