19740199 has 2 divisors, whose sum is σ = 19740200. Its totient is φ = 19740198.

The previous prime is 19740197. The next prime is 19740209. The reversal of 19740199 is 99104791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19740199 - 2¹ = 19740197 is a prime.

Together with 19740197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19740191) 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, 9870099 + 9870100.

It is an arithmetic number, because the mean of its divisors is an integer number (9870100).

Almost surely, 2^19740199 is an apocalyptic number.

19740199 is a deficient number, since it is larger than the sum of its proper divisors (1).

19740199 is an equidigital number, since it uses as much as digits as its factorization.

19740199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 19740199 is about 4442.9943731677. The cubic root of 19740199 is about 270.2612879850.

The spelling of 19740199 in words is "nineteen million, seven hundred forty thousand, one hundred ninety-nine".