1938197907 has 6 divisors (see below), whose sum is σ = 2799619212. Its totient is φ = 1292131932.

The previous prime is 1938197887. The next prime is 1938197939. The reversal of 1938197907 is 7097918391.

1938197907 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1938197907 - 2¹⁴ = 1938181523 is a prime.

It is a super-2 number, since 2×1938197907² = 7513222253398361298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1938197207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107677653 + ... + 107677670.

It is an arithmetic number, because the mean of its divisors is an integer number (466603202).

Almost surely, 2^1938197907 is an apocalyptic number.

1938197907 is a deficient number, since it is larger than the sum of its proper divisors (861421305).

1938197907 is a wasteful number, since it uses less digits than its factorization.

1938197907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215355329 (or 215355326 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 54.

The square root of 1938197907 is about 44024.9691311646. The cubic root of 1938197907 is about 1246.8074063118.

The spelling of 1938197907 in words is "one billion, nine hundred thirty-eight million, one hundred ninety-seven thousand, nine hundred seven".