1938378307 has 2 divisors, whose sum is σ = 1938378308. Its totient is φ = 1938378306.

The previous prime is 1938378287. The next prime is 1938378317. The reversal of 1938378307 is 7038738391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1938378307 - 2⁷ = 1938378179 is a prime.

It is a super-2 number, since 2×1938378307² = 7514620922096372498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1938378317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969189153 + 969189154.

It is an arithmetic number, because the mean of its divisors is an integer number (969189154).

Almost surely, 2^1938378307 is an apocalyptic number.

1938378307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938378307 is an equidigital number, since it uses as much as digits as its factorization.

1938378307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 1938378307 is about 44027.0179208177. The cubic root of 1938378307 is about 1246.8460877897.

The spelling of 1938378307 in words is "one billion, nine hundred thirty-eight million, three hundred seventy-eight thousand, three hundred seven".