19000409 has 2 divisors, whose sum is σ = 19000410. Its totient is φ = 19000408.

The previous prime is 19000391. The next prime is 19000411. The reversal of 19000409 is 90400091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14707225 + 4293184 = 3835^2 + 2072^2 .

It is an emirp because it is prime and its reverse (90400091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19000409 - 2⁸ = 19000153 is a prime.

It is a super-2 number, since 2×19000409² = 722031084334562, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 19000411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19000469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9500204 + 9500205.

It is an arithmetic number, because the mean of its divisors is an integer number (9500205).

Almost surely, 2^19000409 is an apocalyptic number.

It is an amenable number.

19000409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19000409 is an equidigital number, since it uses as much as digits as its factorization.

19000409 is an evil number, because the sum of its binary digits is even.

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

The square root of 19000409 is about 4358.9458588058. The cubic root of 19000409 is about 266.8420795537.

The spelling of 19000409 in words is "nineteen million, four hundred nine", and thus it is an aban number.