1938789747 has 24 divisors (see below), whose sum is σ = 2836254720. Its totient is φ = 1276112880.

The previous prime is 1938789733. The next prime is 1938789763. The reversal of 1938789747 is 7479878391.

It is not a de Polignac number, because 1938789747 - 2⁸ = 1938789491 is a prime.

It is a super-3 number, since 3×1938789747³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1938789707) 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 23 ways as a sum of consecutive naturals, for example, 237154 + ... + 245192.

It is an arithmetic number, because the mean of its divisors is an integer number (118177280).

Almost surely, 2^1938789747 is an apocalyptic number.

1938789747 is a deficient number, since it is larger than the sum of its proper divisors (897464973).

1938789747 is a wasteful number, since it uses less digits than its factorization.

1938789747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8383 (or 8380 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The square root of 1938789747 is about 44031.6902582674. The cubic root of 1938789747 is about 1246.9343000271.

The spelling of 1938789747 in words is "one billion, nine hundred thirty-eight million, seven hundred eighty-nine thousand, seven hundred forty-seven".