1938380117 has 4 divisors (see below), whose sum is σ = 1948528896. Its totient is φ = 1928231340.

The previous prime is 1938380113. The next prime is 1938380123. The reversal of 1938380117 is 7110838391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1938380117 - 2² = 1938380113 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 (1938380113) 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, 5074103 + ... + 5074484.

It is an arithmetic number, because the mean of its divisors is an integer number (487132224).

Almost surely, 2^1938380117 is an apocalyptic number.

It is an amenable number.

1938380117 is a deficient number, since it is larger than the sum of its proper divisors (10148779).

1938380117 is a wasteful number, since it uses less digits than its factorization.

1938380117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148778.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1938380117 is about 44027.0384763727. The cubic root of 1938380117 is about 1246.8464758788.

The spelling of 1938380117 in words is "one billion, nine hundred thirty-eight million, three hundred eighty thousand, one hundred seventeen".