16729409 has 2 divisors, whose sum is σ = 16729410. Its totient is φ = 16729408.

The previous prime is 16729403. The next prime is 16729457. The reversal of 16729409 is 90492761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 148225 = 4072^2 + 385^2 .

It is an emirp because it is prime and its reverse (90492761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16729409 - 2⁴ = 16729393 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16729403) 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, 8364704 + 8364705.

It is an arithmetic number, because the mean of its divisors is an integer number (8364705).

Almost surely, 2^16729409 is an apocalyptic number.

It is an amenable number.

16729409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16729409 is an equidigital number, since it uses as much as digits as its factorization.

16729409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 16729409 is about 4090.1600213195. The cubic root of 16729409 is about 255.7566096954.

The spelling of 16729409 in words is "sixteen million, seven hundred twenty-nine thousand, four hundred nine".