1938738915 has 64 divisors (see below), whose sum is σ = 3644928000. Its totient is φ = 976147200.

The previous prime is 1938738911. The next prime is 1938738917. The reversal of 1938738915 is 5198378391.

It is not a de Polignac number, because 1938738915 - 2² = 1938738911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1938738911) 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 63 ways as a sum of consecutive naturals, for example, 165936 + ... + 177234.

It is an arithmetic number, because the mean of its divisors is an integer number (56952000).

Almost surely, 2^1938738915 is an apocalyptic number.

1938738915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1938738915 is a deficient number, since it is larger than the sum of its proper divisors (1706189085).

1938738915 is a wasteful number, since it uses less digits than its factorization.

1938738915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11385 (or 11379 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1938738915 is about 44031.1130338537. The cubic root of 1938738915 is about 1246.9234023836.

The spelling of 1938738915 in words is "one billion, nine hundred thirty-eight million, seven hundred thirty-eight thousand, nine hundred fifteen".