1938378313 has 8 divisors (see below), whose sum is σ = 1968350976. Its totient is φ = 1908480000.

The previous prime is 1938378307. The next prime is 1938378317. The reversal of 1938378313 is 3138738391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1938378313 - 2⁹ = 1938377801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938378317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35145 + ... + 71497.

It is an arithmetic number, because the mean of its divisors is an integer number (246043872).

Almost surely, 2^1938378313 is an apocalyptic number.

It is an amenable number.

1938378313 is a deficient number, since it is larger than the sum of its proper divisors (29972663).

1938378313 is an equidigital number, since it uses as much as digits as its factorization.

1938378313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37175.

The product of its digits is 326592, while the sum is 46.

The square root of 1938378313 is about 44027.0179889576. The cubic root of 1938378313 is about 1246.8460890762.

The spelling of 1938378313 in words is "one billion, nine hundred thirty-eight million, three hundred seventy-eight thousand, three hundred thirteen".