1938940907 has 12 divisors (see below), whose sum is σ = 2004550704. Its totient is φ = 1875278160.

The previous prime is 1938940903. The next prime is 1938940919. The reversal of 1938940907 is 7090498391.

It is not a de Polignac number, because 1938940907 - 2² = 1938940903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938940903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185357 + ... + 195537.

It is an arithmetic number, because the mean of its divisors is an integer number (167045892).

Almost surely, 2^1938940907 is an apocalyptic number.

1938940907 is a deficient number, since it is larger than the sum of its proper divisors (65609797).

1938940907 is a wasteful number, since it uses less digits than its factorization.

1938940907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370 (or 10327 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1938940907 is about 44033.4067158107. The cubic root of 1938940907 is about 1246.9667054131.

The spelling of 1938940907 in words is "one billion, nine hundred thirty-eight million, nine hundred forty thousand, nine hundred seven".