2085409 has 2 divisors, whose sum is σ = 2085410. Its totient is φ = 2085408.

The previous prime is 2085379. The next prime is 2085469. The reversal of 2085409 is 9045802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2039184 + 46225 = 1428^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2085409 - 2¹⁹ = 1561121 is a prime.

2085409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2085469) 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, 1042704 + 1042705.

It is an arithmetic number, because the mean of its divisors is an integer number (1042705).

2^2085409 is an apocalyptic number.

It is an amenable number.

2085409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2085409 is an equidigital number, since it uses as much as digits as its factorization.

2085409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2085409 is about 1444.0945259920. The cubic root of 2085409 is about 127.7606407319.

The spelling of 2085409 in words is "two million, eighty-five thousand, four hundred nine".