1938908928 has 144 divisors (see below), whose sum is σ = 5782525056. Its totient is φ = 571576320.

The previous prime is 1938908927. The next prime is 1938908963. The reversal of 1938908928 is 8298098391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938908921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309475 + ... + 315677.

It is an arithmetic number, because the mean of its divisors is an integer number (40156424).

Almost surely, 2^1938908928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1938908928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2891262528).

1938908928 is an abundant number, since it is smaller than the sum of its proper divisors (3843616128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1938908928 is a wasteful number, since it uses less digits than its factorization.

1938908928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270 (or 6256 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 57.

The square root of 1938908928 is about 44033.0435922842. The cubic root of 1938908928 is about 1246.9598499579.

The spelling of 1938908928 in words is "one billion, nine hundred thirty-eight million, nine hundred eight thousand, nine hundred twenty-eight".