1938428717 has 4 divisors (see below), whose sum is σ = 1938522300. Its totient is φ = 1938335136.

The previous prime is 1938428711. The next prime is 1938428747. The reversal of 1938428717 is 7178248391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7178248391 = 18047 ⋅397753.

It can be written as a sum of positive squares in 2 ways, for example, as 1204506436 + 733922281 = 34706^2 + 27091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938428717 - 2¹⁰ = 1938427693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938428711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368 + ... + 62265.

It is an arithmetic number, because the mean of its divisors is an integer number (484630575).

Almost surely, 2^1938428717 is an apocalyptic number.

It is an amenable number.

1938428717 is a deficient number, since it is larger than the sum of its proper divisors (93583).

1938428717 is an equidigital number, since it uses as much as digits as its factorization.

1938428717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93582.

The product of its digits is 677376, while the sum is 50.

The square root of 1938428717 is about 44027.5904064713. The cubic root of 1938428717 is about 1246.8568963035.

The spelling of 1938428717 in words is "one billion, nine hundred thirty-eight million, four hundred twenty-eight thousand, seven hundred seventeen".