3781859891 has 8 divisors (see below), whose sum is σ = 3899644560. Its totient is φ = 3665794912.

The previous prime is 3781859881. The next prime is 3781859909. The reversal of 3781859891 is 1989581873.

3781859891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3781859891 - 2¹⁸ = 3781597747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3781859891.

It is not an unprimeable number, because it can be changed into a prime (3781859881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425456 + ... + 434253.

It is an arithmetic number, because the mean of its divisors is an integer number (487455570).

Almost surely, 2^3781859891 is an apocalyptic number.

3781859891 is a deficient number, since it is larger than the sum of its proper divisors (117784669).

3781859891 is an equidigital number, since it uses as much as digits as its factorization.

3781859891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859845.

The product of its digits is 4354560, while the sum is 59.

The square root of 3781859891 is about 61496.8283003278. The cubic root of 3781859891 is about 1558.0036773686.

The spelling of 3781859891 in words is "three billion, seven hundred eighty-one million, eight hundred fifty-nine thousand, eight hundred ninety-one".