1938338057 has 2 divisors, whose sum is σ = 1938338058. Its totient is φ = 1938338056.

The previous prime is 1938338053. The next prime is 1938338071. The reversal of 1938338057 is 7508338391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1762404361 + 175933696 = 41981^2 + 13264^2 .

It is an emirp because it is prime and its reverse (7508338391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1938338057 - 2² = 1938338053 is a prime.

It is not a weakly prime, because it can be changed into another prime (1938338053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969169028 + 969169029.

It is an arithmetic number, because the mean of its divisors is an integer number (969169029).

Almost surely, 2^1938338057 is an apocalyptic number.

It is an amenable number.

1938338057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938338057 is an equidigital number, since it uses as much as digits as its factorization.

1938338057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1938338057 is about 44026.5608127639. The cubic root of 1938338057 is about 1246.8374575682.

The spelling of 1938338057 in words is "one billion, nine hundred thirty-eight million, three hundred thirty-eight thousand, fifty-seven".