1938217 has 2 divisors, whose sum is σ = 1938218. Its totient is φ = 1938216.

The previous prime is 1938203. The next prime is 1938227. The reversal of 1938217 is 7128391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1449616 + 488601 = 1204^2 + 699^2 .

It is an emirp because it is prime and its reverse (7128391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938217 is a prime.

It is a Chen prime.

It is equal to p₁₄₄₆₇₉ and since 1938217 and 144679 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1938227) 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, 969108 + 969109.

It is an arithmetic number, because the mean of its divisors is an integer number (969109).

2^1938217 is an apocalyptic number.

It is an amenable number.

1938217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938217 is an equidigital number, since it uses as much as digits as its factorization.

1938217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1938217 is about 1392.1986208871. The cubic root of 1938217 is about 124.6811500358.

The spelling of 1938217 in words is "one million, nine hundred thirty-eight thousand, two hundred seventeen".