19985219 has 2 divisors, whose sum is σ = 19985220. Its totient is φ = 19985218.

The previous prime is 19985209. The next prime is 19985227. The reversal of 19985219 is 91258991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19985219 - 2⁸ = 19984963 is a prime.

It is a super-2 number, since 2×19985219² = 798817956955922, which contains 22 as substring.

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 19985219.

It is not a weakly prime, because it can be changed into another prime (19985209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992609 + 9992610.

It is an arithmetic number, because the mean of its divisors is an integer number (9992610).

Almost surely, 2^19985219 is an apocalyptic number.

19985219 is a deficient number, since it is larger than the sum of its proper divisors (1).

19985219 is an equidigital number, since it uses as much as digits as its factorization.

19985219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 44.

The square root of 19985219 is about 4470.4830835157. The cubic root of 19985219 is about 271.3748755014.

The spelling of 19985219 in words is "nineteen million, nine hundred eighty-five thousand, two hundred nineteen".