16809437 has 2 divisors, whose sum is σ = 16809438. Its totient is φ = 16809436.

The previous prime is 16809407. The next prime is 16809439. The reversal of 16809437 is 73490861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 7695076 = 3019^2 + 2774^2 .

It is an emirp because it is prime and its reverse (73490861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16809437 - 2¹⁶ = 16743901 is a prime.

Together with 16809439, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16809437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16809439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8404718 + 8404719.

It is an arithmetic number, because the mean of its divisors is an integer number (8404719).

Almost surely, 2^16809437 is an apocalyptic number.

It is an amenable number.

16809437 is a deficient number, since it is larger than the sum of its proper divisors (1).

16809437 is an equidigital number, since it uses as much as digits as its factorization.

16809437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 16809437 is about 4099.9313408885. The cubic root of 16809437 is about 256.1637796780.

The spelling of 16809437 in words is "sixteen million, eight hundred nine thousand, four hundred thirty-seven".