1938939768 has 192 divisors, whose sum is σ = 5694998400. Its totient is φ = 617258880.

The previous prime is 1938939727. The next prime is 1938939803. The reversal of 1938939768 is 8679398391.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 9189183 + ... + 9189393.

It is an arithmetic number, because the mean of its divisors is an integer number (29661450).

Almost surely, 2^1938939768 is an apocalyptic number.

1938939768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1938939768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2847499200).

1938939768 is an abundant number, since it is smaller than the sum of its proper divisors (3756058632).

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

1938939768 is a wasteful number, since it uses less digits than its factorization.

1938939768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 408 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 1938939768 is about 44033.3937824465. The cubic root of 1938939768 is about 1246.9664612428.

The spelling of 1938939768 in words is "one billion, nine hundred thirty-eight million, nine hundred thirty-nine thousand, seven hundred sixty-eight".