19807019 has 2 divisors, whose sum is σ = 19807020. Its totient is φ = 19807018.

The previous prime is 19807013. The next prime is 19807027. The reversal of 19807019 is 91070891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19807019 - 2⁸ = 19806763 is a prime.

It is a super-2 number, since 2×19807019² = 784636003332722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19807019.

It is not a weakly prime, because it can be changed into another prime (19807013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9903509 + 9903510.

It is an arithmetic number, because the mean of its divisors is an integer number (9903510).

Almost surely, 2^19807019 is an apocalyptic number.

19807019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19807019 is an equidigital number, since it uses as much as digits as its factorization.

19807019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 19807019 is about 4450.5077238446. The cubic root of 19807019 is about 270.5658867593.

The spelling of 19807019 in words is "nineteen million, eight hundred seven thousand, nineteen".