1938376457 has 2 divisors, whose sum is σ = 1938376458. Its totient is φ = 1938376456.

The previous prime is 1938376423. The next prime is 1938376487. The reversal of 1938376457 is 7546738391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1473715321 + 464661136 = 38389^2 + 21556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938376457 - 2⁸ = 1938376201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1938376399 and 1938376408.

It is not a weakly prime, because it can be changed into another prime (1938376487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969188228 + 969188229.

It is an arithmetic number, because the mean of its divisors is an integer number (969188229).

Almost surely, 2^1938376457 is an apocalyptic number.

It is an amenable number.

1938376457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938376457 is an equidigital number, since it uses as much as digits as its factorization.

1938376457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 53.

The square root of 1938376457 is about 44026.9969109863. The cubic root of 1938376457 is about 1246.8456911237.

The spelling of 1938376457 in words is "one billion, nine hundred thirty-eight million, three hundred seventy-six thousand, four hundred fifty-seven".