1810409 has 2 divisors, whose sum is σ = 1810410. Its totient is φ = 1810408.

The previous prime is 1810397. The next prime is 1810421. The reversal of 1810409 is 9040181.

It is a balanced prime because it is at equal distance from previous prime (1810397) and next prime (1810421).

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 120409 = 1300^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1810409 - 2⁸ = 1810153 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 (1810439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905204 + 905205.

It is an arithmetic number, because the mean of its divisors is an integer number (905205).

2^1810409 is an apocalyptic number.

It is an amenable number.

1810409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1810409 is an equidigital number, since it uses as much as digits as its factorization.

1810409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1810409 is about 1345.5143997743. The cubic root of 1810409 is about 121.8780695260.

The spelling of 1810409 in words is "one million, eight hundred ten thousand, four hundred nine".