19040009 has 2 divisors, whose sum is σ = 19040010. Its totient is φ = 19040008.

The previous prime is 19039997. The next prime is 19040023. The reversal of 19040009 is 90004091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 73984 = 4355^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 19040009 - 2⁸ = 19039753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19040039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9520004 + 9520005.

It is an arithmetic number, because the mean of its divisors is an integer number (9520005).

Almost surely, 2^19040009 is an apocalyptic number.

It is an amenable number.

19040009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19040009 is an equidigital number, since it uses as much as digits as its factorization.

19040009 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 19040009 is about 4363.4858771400. The cubic root of 19040009 is about 267.0273319474.

The spelling of 19040009 in words is "nineteen million, forty thousand, nine".