2016409 has 2 divisors, whose sum is σ = 2016410. Its totient is φ = 2016408.

The previous prime is 2016407. The next prime is 2016419. The reversal of 2016409 is 9046102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2016400 + 9 = 1420^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 2016409 - 2¹ = 2016407 is a prime.

Together with 2016407, 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 2016409.

It is not a weakly prime, because it can be changed into another prime (2016401) 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 as a sum of consecutive naturals, namely, 1008204 + 1008205.

It is an arithmetic number, because the mean of its divisors is an integer number (1008205).

2^2016409 is an apocalyptic number.

It is an amenable number.

2016409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2016409 is an equidigital number, since it uses as much as digits as its factorization.

2016409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2016409 is about 1420.0031690105. The cubic root of 2016409 is about 126.3357343354.

The spelling of 2016409 in words is "two million, sixteen thousand, four hundred nine".