1897009 has 2 divisors, whose sum is σ = 1897010. Its totient is φ = 1897008.

The previous prime is 1897001. The next prime is 1897037. The reversal of 1897009 is 9007981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 815409 = 1040^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897009 - 2³ = 1897001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1897001) 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, 948504 + 948505.

It is an arithmetic number, because the mean of its divisors is an integer number (948505).

2^1897009 is an apocalyptic number.

It is an amenable number.

1897009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897009 is an equidigital number, since it uses as much as digits as its factorization.

1897009 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 1897009 is about 1377.3194981557. The cubic root of 1897009 is about 123.7912069009.

The spelling of 1897009 in words is "one million, eight hundred ninety-seven thousand, nine".