1938791000 has 32 divisors (see below), whose sum is σ = 4536773280. Its totient is φ = 775516000.

The previous prime is 1938790991. The next prime is 1938791011. The reversal of 1938791000 is 1978391.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968396 + ... + 970395.

It is an arithmetic number, because the mean of its divisors is an integer number (141774165).

Almost surely, 2^1938791000 is an apocalyptic number.

1938791000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1938791000 is an abundant number, since it is smaller than the sum of its proper divisors (2597982280).

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

1938791000 is a wasteful number, since it uses less digits than its factorization.

1938791000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938812 (or 1938798 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 1938791000 is about 44031.7044866537. The cubic root of 1938791000 is about 1246.9345686497.

The spelling of 1938791000 in words is "one billion, nine hundred thirty-eight million, seven hundred ninety-one thousand".