19893197 has 2 divisors, whose sum is σ = 19893198. Its totient is φ = 19893196.

The previous prime is 19893169. The next prime is 19893221. The reversal of 19893197 is 79139891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 81796 = 4451^2 + 286^2 .

It is an emirp because it is prime and its reverse (79139891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19893197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19893127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9946598 + 9946599.

It is an arithmetic number, because the mean of its divisors is an integer number (9946599).

Almost surely, 2^19893197 is an apocalyptic number.

It is an amenable number.

19893197 is a deficient number, since it is larger than the sum of its proper divisors (1).

19893197 is an equidigital number, since it uses as much as digits as its factorization.

19893197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 19893197 is about 4460.1790322811. The cubic root of 19893197 is about 270.9577191065.

The spelling of 19893197 in words is "nineteen million, eight hundred ninety-three thousand, one hundred ninety-seven".