19806419 has 2 divisors, whose sum is σ = 19806420. Its totient is φ = 19806418.

The previous prime is 19806401. The next prime is 19806443. The reversal of 19806419 is 91460891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19806419 - 2¹⁶ = 19740883 is a prime.

It is a super-2 number, since 2×19806419² = 784588467207122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19806469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9903209 + 9903210.

It is an arithmetic number, because the mean of its divisors is an integer number (9903210).

Almost surely, 2^19806419 is an apocalyptic number.

19806419 is a deficient number, since it is larger than the sum of its proper divisors (1).

19806419 is an equidigital number, since it uses as much as digits as its factorization.

19806419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 19806419 is about 4450.4403152947. The cubic root of 19806419 is about 270.5631547114.

The spelling of 19806419 in words is "nineteen million, eight hundred six thousand, four hundred nineteen".