1938197 has 2 divisors, whose sum is σ = 1938198. Its totient is φ = 1938196.

The previous prime is 1938191. The next prime is 1938199. The reversal of 1938197 is 7918391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1661521 + 276676 = 1289^2 + 526^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938197 - 2⁸ = 1937941 is a prime.

It is a super-2 number, since 2×1938197² = 7513215221618, which contains 22 as substring.

Together with 1938199, it forms a pair of twin primes.

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 1938197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969098 + 969099.

It is an arithmetic number, because the mean of its divisors is an integer number (969099).

2^1938197 is an apocalyptic number.

It is an amenable number.

1938197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938197 is an equidigital number, since it uses as much as digits as its factorization.

1938197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 1938197 is about 1392.1914379855. The cubic root of 1938197 is about 124.6807211826.

The spelling of 1938197 in words is "one million, nine hundred thirty-eight thousand, one hundred ninety-seven".