1938791906 has 8 divisors (see below), whose sum is σ = 2931087360. Its totient is φ = 961762788.

The previous prime is 1938791893. The next prime is 1938791917. The reversal of 1938791906 is 6091978391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1938791906² = 7517828109542225672, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 3816266 + ... + 3816773.

It is an arithmetic number, because the mean of its divisors is an integer number (366385920).

Almost surely, 2^1938791906 is an apocalyptic number.

1938791906 is a deficient number, since it is larger than the sum of its proper divisors (992295454).

1938791906 is a wasteful number, since it uses less digits than its factorization.

1938791906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7633168.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1938791906 is about 44031.7147746939. The cubic root of 1938791906 is about 1246.9347628811.

The spelling of 1938791906 in words is "one billion, nine hundred thirty-eight million, seven hundred ninety-one thousand, nine hundred six".