1938418193 has 2 divisors, whose sum is σ = 1938418194. Its totient is φ = 1938418192.

The previous prime is 1938418187. The next prime is 1938418253. The reversal of 1938418193 is 3918148391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1212223489 + 726194704 = 34817^2 + 26948^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938418193 - 2¹⁶ = 1938352657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1938418393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969209096 + 969209097.

It is an arithmetic number, because the mean of its divisors is an integer number (969209097).

Almost surely, 2^1938418193 is an apocalyptic number.

It is an amenable number.

1938418193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938418193 is an equidigital number, since it uses as much as digits as its factorization.

1938418193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 47.

The square root of 1938418193 is about 44027.4708903430. The cubic root of 1938418193 is about 1246.8546398461.

The spelling of 1938418193 in words is "one billion, nine hundred thirty-eight million, four hundred eighteen thousand, one hundred ninety-three".