19385897 has 2 divisors, whose sum is σ = 19385898. Its totient is φ = 19385896.

The previous prime is 19385887. The next prime is 19385921. The reversal of 19385897 is 79858391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17147881 + 2238016 = 4141^2 + 1496^2 .

It is an emirp because it is prime and its reverse (79858391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19385897 - 2¹⁶ = 19320361 is a prime.

It is not a weakly prime, because it can be changed into another prime (19385827) 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, 9692948 + 9692949.

It is an arithmetic number, because the mean of its divisors is an integer number (9692949).

Almost surely, 2^19385897 is an apocalyptic number.

It is an amenable number.

19385897 is a deficient number, since it is larger than the sum of its proper divisors (1).

19385897 is an equidigital number, since it uses as much as digits as its factorization.

19385897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 50.

The square root of 19385897 is about 4402.9418574403. The cubic root of 19385897 is about 268.6346112181.

The spelling of 19385897 in words is "nineteen million, three hundred eighty-five thousand, eight hundred ninety-seven".