3820389991 has 24 divisors (see below), whose sum is σ = 4452840000. Its totient is φ = 3263969280.

The previous prime is 3820389973. The next prime is 3820390051. The reversal of 3820389991 is 1999830283.

It is not a de Polignac number, because 3820389991 - 2⁷ = 3820389863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3820389931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2568450 + ... + 2569936.

It is an arithmetic number, because the mean of its divisors is an integer number (185535000).

Almost surely, 2^3820389991 is an apocalyptic number.

3820389991 is a deficient number, since it is larger than the sum of its proper divisors (632450009).

3820389991 is a wasteful number, since it uses less digits than its factorization.

3820389991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775 (or 2764 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 3820389991 is about 61809.3034340301. The cubic root of 3820389991 is about 1563.2768604594.

The spelling of 3820389991 in words is "three billion, eight hundred twenty million, three hundred eighty-nine thousand, nine hundred ninety-one".