1798009 has 2 divisors, whose sum is σ = 1798010. Its totient is φ = 1798008.

The previous prime is 1798003. The next prime is 1798021. The reversal of 1798009 is 9008971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1272384 + 525625 = 1128^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1798009 - 2³ = 1798001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1798001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899004 + 899005.

It is an arithmetic number, because the mean of its divisors is an integer number (899005).

2^1798009 is an apocalyptic number.

It is an amenable number.

1798009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798009 is an equidigital number, since it uses as much as digits as its factorization.

1798009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1798009 is about 1340.8985793116. The cubic root of 1798009 is about 121.5991727567.

The spelling of 1798009 in words is "one million, seven hundred ninety-eight thousand, nine".