1090409 has 2 divisors, whose sum is σ = 1090410. Its totient is φ = 1090408.

The previous prime is 1090403. The next prime is 1090421. The reversal of 1090409 is 9040901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896809 + 193600 = 947^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090409 - 2⁸ = 1090153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1090403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545204 + 545205.

It is an arithmetic number, because the mean of its divisors is an integer number (545205).

2^1090409 is an apocalyptic number.

It is an amenable number.

1090409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090409 is an equidigital number, since it uses as much as digits as its factorization.

1090409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1090409 is about 1044.2265079953. The cubic root of 1090409 is about 102.9271171964.

The spelling of 1090409 in words is "one million, ninety thousand, four hundred nine".